Grab a set of case chamber gauges and you should be able to verify.
I haven't had good luck with the larue triggers. I have found them very finicky. I have had 2 go full auto on me that got sent back.
Swap in another trigger and see if the same thing happens.
Poor-arue build:
This all started when one of you assholes posted a pretty killer clearance sale link for Larue barrels. The 16" 308 8 twist Stealth got my interest since I had a new KGM R30T and some other random large frame parts. The wheels got to turning from there.
Info on receiver sets.
So I'd initially planned to build this as a DPMS style using an Aero M5 upper on a JL Billet ambi lower. For some stupid reason JL Billet doesn't make a high profile upper to go with there lower. The short of it is the Aero upper fits like shit on the JL lower. I kind of went down the rabbit whole from there. Ordered a Bkings matched upper/lower set + 1 upper. The B kings set is the best deal hands down for large frame IMO right now.
The BK Mod-0 thermal upper with the ambi lower was $285 on sale. It fits so well I can hold it upside down without pins. I have also verified the Mod- 0 uppers extension bore is .004 undersized for thermal fit depending on barrel extension. That Thermal fit is uncommon for large frames especially at that price point. The extra BK Mod-0 upper does in fact fit the JL Billet lower much better than the Aero. Lines don't match up very well, but fit is excellent.
In the spirit of this being a Poor-arue build I also ordered an AR10 style Stag receiver set. Decided to go with the Stag set for this.
Build list:
See that little plastic piece next to the screwdriver, I'll get to that in a minute.
Machined .040 off the bottom of the Hera gas block to give more clearance to the spine in the bottom of the CMR handguard. Those Centurion rails are rigid & I like them, but they don't have much clearance for gas blocks.
I've been using either Dark hour defense or PWS extensions with the extended tail to support the carrier. I've done some rudimentary testing on small frames comparing these to a std extension. When you close the receiver using the extended tail extension I can see the back of the carrier lift as it closes. This does not happen with std extensions. I'm a proponent of squaring the bolts up best as possible. It was bugging me a little that with the Law folder, there is no rear carrier support possible with the above mentioned extensions. This is where that little plastic piece comes into play.
Figured why not. So I machined that from Ultem (high temp, strong, oil resistant plastic). It slides down into the un-used buffer detant hole in the receiver. That little dog point set screw pictured above screws in from the back of the receiver to lock it in. Now my carrier has support with the law folder.
Shown below mocked up with a std extension checking alignment. Does it matter? Hell if I know.
Got it to the range just to break in and get some brass formed to chamber. Had to make 1 adjustment to gas block closing 1/4 turn.
Ran 4 different loads Noma Tac 150FMJ, Old milsurp Sig 58 Patronen FMJ magnetic, Southern munitions loaded with 155 Hornady HPBT, & of coarse FGMM 168.
The Norma Tac & the FGMM are within 20fps and both shot the best. Norma just over moa & FGMM just under moa.
Then took the FGMM out to 500 x 5 on steel. Very pleased with how it turned out. Cycled all the ammo without a hickup.
Hand loads next.
As a side note: I really like how the Stag receiver lines appear to align with the hand-guard (last picture).
5 @ 500 FGMM
This all started when one of you assholes posted a pretty killer clearance sale link for Larue barrels. The 16" 308 8 twist Stealth got my interest since I had a new KGM R30T and some other random large frame parts. The wheels got to turning from there.
Info on receiver sets.
So I'd initially planned to build this as a DPMS style using an Aero M5 upper on a JL Billet ambi lower. For some stupid reason JL Billet doesn't make a high profile upper to go with there lower. The short of it is the Aero upper fits like shit on the JL lower. I kind of went down the rabbit whole from there. Ordered a Bkings matched upper/lower set + 1 upper. The B kings set is the best deal hands down for large frame IMO right now.
The BK Mod-0 thermal upper with the ambi lower was $285 on sale. It fits so well I can hold it upside down without pins. I have also verified the Mod- 0 uppers extension bore is .004 undersized for thermal fit depending on barrel extension. That Thermal fit is uncommon for large frames especially at that price point. The extra BK Mod-0 upper does in fact fit the JL Billet lower much better than the Aero. Lines don't match up very well, but fit is excellent.
In the spirit of this being a Poor-arue build I also ordered an AR10 style Stag receiver set. Decided to go with the Stag set for this.
Build list:
- Stag AR10 receiver set pins included
- Larue Stealth 16" 308 8 twist mid gas made from Atlas shrugged steel
- Hera adjustable gas block with threaded in tube (made in Germany)
- Brownel's low mass carrier
- Rubber city Armory HP bolt & pin
- Battle arms pro ambi selector 45 degree
- Geissele Super charging handle
- Geissele National match trigger
- Wilson Starbust/BCM grip
- Centurion 14" CMR handguard original style
- Magpul enhanced aluminum trigger guard
- Law tactical folder
- Vltor I-mod clubfoot stock & extension
- JP polished carbine buffer spring
- Odin Works adjustable AR10 carbine buffer weight, set to 4.65 oz
- LWRC skirmish BUIS
- KGM R30T
- Vortex PST 2 mil 2-10 in Midwest QD mount
- Larue mags
Machined .040 off the bottom of the Hera gas block to give more clearance to the spine in the bottom of the CMR handguard. Those Centurion rails are rigid & I like them, but they don't have much clearance for gas blocks.
I've been using either Dark hour defense or PWS extensions with the extended tail to support the carrier. I've done some rudimentary testing on small frames comparing these to a std extension. When you close the receiver using the extended tail extension I can see the back of the carrier lift as it closes. This does not happen with std extensions. I'm a proponent of squaring the bolts up best as possible. It was bugging me a little that with the Law folder, there is no rear carrier support possible with the above mentioned extensions. This is where that little plastic piece comes into play.
Figured why not. So I machined that from Ultem (high temp, strong, oil resistant plastic). It slides down into the un-used buffer detant hole in the receiver. That little dog point set screw pictured above screws in from the back of the receiver to lock it in. Now my carrier has support with the law folder.
Shown below mocked up with a std extension checking alignment. Does it matter? Hell if I know.
Got it to the range just to break in and get some brass formed to chamber. Had to make 1 adjustment to gas block closing 1/4 turn.
Ran 4 different loads Noma Tac 150FMJ, Old milsurp Sig 58 Patronen FMJ magnetic, Southern munitions loaded with 155 Hornady HPBT, & of coarse FGMM 168.
The Norma Tac & the FGMM are within 20fps and both shot the best. Norma just over moa & FGMM just under moa.
Then took the FGMM out to 500 x 5 on steel. Very pleased with how it turned out. Cycled all the ammo without a hickup.
Hand loads next.
As a side note: I really like how the Stag receiver lines appear to align with the hand-guard (last picture).
5 @ 500 FGMM
How do you like that scope?Poor-arue build:
This all started when one of you assholes posted a pretty killer clearance sale link for Larue barrels. The 16" 308 8 twist Stealth got my interest since I had a new KGM R30T and some other random large frame parts. The wheels got to turning from there.
Info on receiver sets.
So I'd initially planned to build this as a DPMS style using an Aero M5 upper on a JL Billet ambi lower. For some stupid reason JL Billet doesn't make a high profile upper to go with there lower. The short of it is the Aero upper fits like shit on the JL lower. I kind of went down the rabbit whole from there. Ordered a Bkings matched upper/lower set + 1 upper. The B kings set is the best deal hands down for large frame IMO right now.
The BK Mod-0 thermal upper with the ambi lower was $285 on sale. It fits so well I can hold it upside down without pins. I have also verified the Mod- 0 uppers extension bore is .004 undersized for thermal fit depending on barrel extension. That Thermal fit is uncommon for large frames especially at that price point. The extra BK Mod-0 upper does in fact fit the JL Billet lower much better than the Aero. Lines don't match up very well, but fit is excellent.
View attachment 8438757
In the spirit of this being a Poor-arue build I also ordered an AR10 style Stag receiver set. Decided to go with the Stag set for this.
Build list:
Upper was loose extension fit like the Aero. The extension was also out of square. Trued the face and used 2 full wraps of ss shim stock on the extension (.004"). Used a trigger shims .005 for front take down pin. Used the stag receiver tension screw set for firm drag on the rear pin. Machined the Stag lower for a PDQ ambi bolt catch as I'd been wanting to try the large frame version. I had to machine the notch in the PDQ .060 wider towards the magwell side.
- Stag AR10 receiver set pins included
- Larue Stealth 16" 308 8 twist mid gas made from Atlas shrugged steel
- Hera adjustable gas block with threaded in tube (made in Germany)
- Brownel's low mass carrier
- Rubber city Armory HP bolt & pin
- Battle arms pro ambi selector 45 degree
- Geissele Super charging handle
- Geissele National match trigger
- Wilson Starbust/BCM grip
- Centurion 14" CMR handguard original style
- Magpul enhanced aluminum trigger guard
- Law tactical folder
- Vltor I-mod clubfoot stock & extension
- JP polished carbine buffer spring
- Odin Works adjustable AR10 carbine buffer weight, set to 4.65 oz
- LWRC skirmish BUIS
- KGM R30T
- Vortex PST 2 mil 2-10 in Midwest QD mount
- Larue mags
View attachment 8438771See that little plastic piece next to the screwdriver, I'll get to that in a minute.
Machined .040 off the bottom of the Hera gas block to give more clearance to the spine in the bottom of the CMR handguard. Those Centurion rails are rigid & I like them, but they don't have much clearance for gas blocks.
View attachment 8438806
I've been using either Dark hour defense or PWS extensions with the extended tail to support the carrier. I've done some rudimentary testing on small frames comparing these to a std extension. When you close the receiver using the extended tail extension I can see the back of the carrier lift as it closes. This does not happen with std extensions. I'm a proponent of squaring the bolts up best as possible. It was bugging me a little that with the Law folder, there is no rear carrier support possible with the above mentioned extensions. This is where that little plastic piece comes into play.
Figured why not. So I machined that from Ultem (high temp, strong, oil resistant plastic). It slides down into the un-used buffer detant hole in the receiver. That little dog point set screw pictured above screws in from the back of the receiver to lock it in. Now my carrier has support with the law folder.
Shown below mocked up with a std extension checking alignment. Does it matter? Hell if I know.
View attachment 8438835
Got it to the range just to break in and get some brass formed to chamber. Had to make 1 adjustment to gas block closing 1/4 turn.
Ran 4 different loads Noma Tac 150FMJ, Old milsurp Sig 58 Patronen FMJ magnetic, Southern munitions loaded with 155 Hornady HPBT, & of coarse FGMM 168.
The Norma Tac & the FGMM are within 20fps and both shot the best. Norma just over moa & FGMM just under moa.
Then took the FGMM out to 500 x 5 on steel. Very pleased with how it turned out. Cycled all the ammo without a hickup.
Hand loads next.
As a side note: I really like how the Stag receiver lines appear to align with the hand-guard (last picture).
View attachment 8438848
5 @ 500 FGMM
View attachment 8438849
View attachment 8438850
View attachment 8438851
I like it a lot. Had it on several guns. Nice having parallax adjustment with the 2-10.
I'm one of those who bought the purple Aero anodized set. Still a work in progress but as it stands.
Aero M5E1 upper, lower, handguard, charging handle, tube.
ADM purple end plate
FCD "Purple Knight" castle nut
Aero LPK + trigger
Cryptic Coatings "Dragons Breath" BCG
Ballistic Advantage 16" 308 barrel ( Schulyer Arms had a sale for $75 on them. Hard to pass it up ) - still debating on maybe doing a 14.5-16" 6.5CM
Rearden "Black Rainbow" Type B muzzle device
Armament Technology SAI 6 LPVO with a Reptilia AUS mount
Still needs a buffer spring/weight, and a gas block/tube, and then to actually assemble/torque it down. Threw it together briefly to take a photo with a Tessa Blue Geissele Super Duty I picked up
Aero M5E1 upper, lower, handguard, charging handle, tube.
ADM purple end plate
FCD "Purple Knight" castle nut
Aero LPK + trigger
Cryptic Coatings "Dragons Breath" BCG
Ballistic Advantage 16" 308 barrel ( Schulyer Arms had a sale for $75 on them. Hard to pass it up ) - still debating on maybe doing a 14.5-16" 6.5CM
Rearden "Black Rainbow" Type B muzzle device
Armament Technology SAI 6 LPVO with a Reptilia AUS mount
Still needs a buffer spring/weight, and a gas block/tube, and then to actually assemble/torque it down. Threw it together briefly to take a photo with a Tessa Blue Geissele Super Duty I picked up
Updated photo. Got a rifle tube and 308 PRS Gen 2 stock, the next question is which criterion barrel to replace the 18 inch one with. I was thinking 22 inch stainless. Also swapping out the SCS spring with a regular spring and buffer so I don’t beat my brass to death. My superlative arms gas block doesn’t really seem to shut gas off no matter how much I close it so might get a Non adjustable as well…decisions decisions.
Attachments
That’s odd about your gas block. Been very happy with mine. I’d definitely reach out to their CS, I found them to be very helpful.
If you take an uninstalled SA gas block and turn it over, you can see the needle valve obstruct the gas port as you screw it in. The needle screw is replaceable if it's damaged or defective. The same is also true of SLR, Aero, and all of the rest of the needle vale AGB's on the market.
6.5 Creedmoor AR10 build list:
Upper parts:
Proof Research 20" stainless, rifle +2 gas, 6.5 CM ..... dimpled ..... cerakote Patriot Brown
Upper receiver: SMF Tactical TAC-10 (SR25 pattern)
Handguard is the KAC URX 4, 15"
Superlative Arms adjustable GB
Surefire MD
JP Precision LMOS BCG
Radian Raptor charging handle
Lower:
Larue Tactical complete lower
MBT-2S trigger
FCD ambi-QD end plate
Topped off with a TT315M
Weighs 9 lbs 2 oz (without scope, mag or bipod). Been shooting 105 grain Sierra Prairie Enemy....thing shoots super soft!
Frigg'n dimples!
Upper parts:
Proof Research 20" stainless, rifle +2 gas, 6.5 CM ..... dimpled ..... cerakote Patriot Brown
Upper receiver: SMF Tactical TAC-10 (SR25 pattern)
Handguard is the KAC URX 4, 15"
Superlative Arms adjustable GB
Surefire MD
JP Precision LMOS BCG
Radian Raptor charging handle
Lower:
Larue Tactical complete lower
MBT-2S trigger
FCD ambi-QD end plate
Topped off with a TT315M
Weighs 9 lbs 2 oz (without scope, mag or bipod). Been shooting 105 grain Sierra Prairie Enemy....thing shoots super soft!
Frigg'n dimples!
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My Mega Maten Megalithic 18” 308 with Athlon Ares 4.5-30x56. I have a 22” 6.5 Creedmoor Proof on order that will be replacing the 308.
L. 7-08, 22", 10t, sig tango 1-10x28 on aero upper/lower, diamondhead handguard, strike ind. brake
R. 6.5prc, 22", 8t, kak upper/lower, diamondhead handguard, ultradyne brake, timney trigger, athlon helos btr g2 1-10x28
R. 6.5prc, 22", 8t, kak upper/lower, diamondhead handguard, ultradyne brake, timney trigger, athlon helos btr g2 1-10x28
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5# 5ozs, 308win 20", smoke comp stock/grip, Tennessee lower, roam magnesium upper, brigand cf handguard, v7 titanuim bcg/brake and light weight pivot/takedown pins/chargehandle/safety, slr Ti gas block & tt trigger.
possible optic will be as it will stay under 6# and maybe just under 5# 12ozs
possible optic will be as it will stay under 6# and maybe just under 5# 12ozs
Attachments
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16” 6.5 CM Build:
Upper:
SLR B36
Craddock RTR 16” 6.5 CM
Superlative AGB
Midwest 12 5/8” AR10 handguard
Odin Works 9” mlok arca rail
Griffin 34mm 15MOA GPM mount
Zeiss LRP S3 6-36 ZF MRi
Lower:
SLR B36
LaRue MB2ST
FCD A5 buffer tube
Sprinco Green
H2 buffer
Magpul PRS stock.
I had this out to 1K yesterday after the IWI match. Went 5/8 on a full size IPSC. Missed the first 3 getting my wind call, then drilled the 1k plate 5 times in a row.
Upper:
SLR B36
Craddock RTR 16” 6.5 CM
Superlative AGB
Midwest 12 5/8” AR10 handguard
Odin Works 9” mlok arca rail
Griffin 34mm 15MOA GPM mount
Zeiss LRP S3 6-36 ZF MRi
Lower:
SLR B36
LaRue MB2ST
FCD A5 buffer tube
Sprinco Green
H2 buffer
Magpul PRS stock.
I had this out to 1K yesterday after the IWI match. Went 5/8 on a full size IPSC. Missed the first 3 getting my wind call, then drilled the 1k plate 5 times in a row.
Attachments
What load are you running? Getting 2570 out of my 308 with 175s hoping to stretch it out.
Not bad, not bad at all. I'm a bit surprised at the velocity the chrono was reading on the AAC stuff. Seemed pretty dang fast for a 17" semi with a 175gr I'm hoping hornady will come out with some factory ammo with the 174gr ELD VT. With a .289 G7 that would keep it supersonic to 1200 also for a 17" 308 semi that is kinda nuts. Just ran the numbers would pretty much equal that 140gr eldm with little less drop and more energy. Have a feeling the 174 is long though so more bearing surface will like cause some loss of velocity
Does the buffer coil bind on the rifle length spring? You should be using a carbine length spring with that combination.
No issues with the spring binding. I thought you could use the green spring in the A5 tube?
Sprinco green is primarily for an AR-15 with a rifle or A5 length action, but there are some LFAR applications. This is a bit confusing, as they don't make it very clear that you use a spacer in a rifle length RE and AR-15 carbine buffer when used on a LFAR, but an intermediate (A5) RE without a spacer should be the same.
" While the Green spring is primarily for use with lesser calibers such as .223, 5.56. 6.8 SPC, 6.5 Grendel, 7.62 X 39, etc. in A2 rifle length tubes, it may sometimes be appropriate for use in long BBL (20”+) rifle length gas BBL’s in heavier calibers such as .308 and 6.5 CM, .260 Rem, etc.. (May not be effective for unsuppressed 7.62 X 51) In the latter scenario, an H2 or H3 carbine buffer has been used successfully in rifle length tubes with the Green spring. Over gassed heavier caliber guns with rifle length tubes may be addressed with our Red or Orange carbine springs and standard length 3.25” carbine buffers along with a spacer to yield the appropriate tube depth for the longer BCG’s. Color Coded GREEN"
How do you like that Odin brake? I'm still undetermined at this time on the 2 I have?
SP10 6.5cm. Only change from factory is a Larue MBT trigger.
Still undecided on how I feel. Need to finish tuning the gas to see if it’s actually doing much.
I do know it will rattle your fillings loose if you’re beside it on the firing line. I shot out to 1k off the top of a conex last week and it cleared the place.
Looks sensational. How does it shoot and how is the weight?
I also oddly enough keep hearing phenomenal reviews about PSA's sabre trigger. Given that it's only $80 i'm tempted to try one.
Everything in that photo is 17.0lbs, empty magazine. I do have a set of weights that add another 12oz, making it a lot more stable from a bag.
It shoots great, a little rough on brass but I’m only shooting hornady 1x or factory ammo out of it. Zero issues with feeding, extraction, or ejection ( +1.5 gas block at factory setting) using the TBAC Dominus.
The factory trigger was nice, but I’m a 2-stage guy, and the MBT is awesome for the price. It is “duty style”, heavy and definitive, with a tactile reset…not unlike the AI triggers I’m used to.
Dang! That’s light, especially with that barrel. Not a knock, use what works for your needs, but why a red dot with a 20” barrel? Or I guess another way to put it “Why so much barrel for something with just a red dot?”
Again, if that works for you, cool. Genuinely curious.
- - -
And BTW, your gun looks like my light(ish) weight AR10 (pencil profile 16” barrel, and a lot of V7, Smoke Composites, etc.), and my uber-light no tax stamp AR15 build (also with a 16” barrel) had a baby that grew up to be bigger than dad!
…sub 4# with a loaded mag and red dot:
It's a 5x optic which will get me to almost 900 yards with the right bullet according to ballistics. I'll probably won't shoot that far, but never know? I just wanted the 10" for velocity.Dang! That’s light, especially with that barrel. Not a knock, use what works for your needs, but why a red dot with a 20” barrel? Or I guess another way to put it “Why so much barrel for something with just a red dot?”
Again, if that works for you, cool. Genuinely curious.
- - -
And BTW, your gun looks like my light(ish) weight AR10 (pencil profile 16” barrel, and a lot of V7, Smoke Composites, etc.), and my uber-light no tax stamp AR15 build (also with a 16” barrel) had a baby that grew up to be bigger than dad!
…sub 4# with a loaded mag and red dot:
That’s pretty cool actually! I knew they made a 3x, but wasn’t tracking on the 5x sight.
I’ve actually been very impressed with the crispness of their dots, durability, and ability to hold zero with their advanced (higher end) red dots. I have them on a couple of the ranch rifles, and often recommend them to friends/family who want a red dot but don’t want to spend Eotech or Aimpoint money.
I only have one of their OG 1x micro prism sights with the ACSS “Cyclops” reticle on a PCC, and it works well for my needs. It’s used primarily as a longer-range tool that takes the same mags as the G21 I usually carry on the ranch, but don’t have enough rounds through that platform yet to say it’s a keeper.
Would love to get a report down the road on long-term reliability of yours; especially on a heavier caliber rifle.
Also @Top O' Texas what BUIS are you running? Kind of look like Bobro, but can’t quite make ‘em out in your pic.
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if you're referring to post 1,040 it's an ultradyne and the rear only has windage adjustment, but the front has wind and elevation adjustments.That’s pretty cool actually! I knew they made a 3x, but wasn’t tracking on the 5x sight.
I’ve actually been very impressed with the crispness of their dots, durability, and ability to hold zero with their advanced (higher end) red dots. I have them on a couple of the ranch rifles, and often recommend them to friends/family who want a red dot but don’t want to spend Eotech or Aimpoint money.
I only have one of their OG 1x micro prism sights with the ACSS “Cyclops” reticle on a PCC, and it works well for my needs. It’s used primarily as a longer-range tool that takes the same mags as the G21 I usually carry on the ranch, but don’t have enough rounds through that platform yet to say it’s a keeper.
Would love to get a report down the road on long-term reliability of yours; especially on a heavier caliber rifle.
Also @Top O' Texas what BUIS are you running? Kind of look like Bobro, but can’t quite make ‘em out in your pic.
gave a test run on my AR6.5PRC build and it went well, but could've been better. shot 2 rounds, ejected @ 1-2 oclock, shot 2 more after 5 more clicks out, shot 2 more with fully out and still ejected at the same as 1st 4. opened up the upper and checked the buffer.........i had a 9.5oz rifle buffer that caused this. i'll either install a standard weight rifle buffer and/or take another lower and use carbine between 3.5-4.5oz. brass looked good and ammo used was factory norma 143 golden target match which was great, cause the mag (larue) accepted the length @ 2.860". norma must've made them for short action lengths. no other factory 6.5PRC ammo to compare with as some could be for xm length mags?
You need less gas to bring the ejection pattern around to 3-4. not more. 1-2 is over gas or undermass.
I apologize, missed the PRC part whoops.
Have you posted build specifics for this in another thread?
What I said is generally correct, but 6.5 PRC is a bigger case. Tuning per ejection pattern with the PRC could be misleading.
The only scenarios I’ve seen that fit your description:
1. Gas port on the small side = unresponsive gas adjustment.
2. Gas tube short not enough engagement in gas key.
3. Short dwell timing i.e. long gas system combined with shortish barrel. For #3 I’d agree, reducing buffer/carrier mass is what I would try.
Build specs
McGowen 8t 22" hbar +2 gas (gas port appx .100"
KAK magnum upper
Aero lower
KAK magnum bcg
Odin adjustable block
Rifle length buffer/tune w/KAK 9.5oz rifle buffer
Mil-spec buffer spring
Timney 3# trigger
Ultradyne brake
Diamondhead handguard
Athlon 1-10x28 Helos BTR Gen2
Burris QD optic mount
L) 7/08rem
R) 6.5PRC
Attachments
I would check gas tube engagement for sure. Should land about middle of the cam pin cut out in upper.
Not all +2" gas tubes are the same.
Both barrels below are RL + 2" & yet tubes are not the same.
straightjacket and rainier........WOW
i knew armalite and wilson had their own interpretation of rifle length, but never experience that issue with the barrel i've bought. everything lines-up (gas port to gas block, gas tube to gas key) and headspace checks out as i have go, no-go for every cartridge i shoot (takes that issue out of the equation). i've built a fair share of ar's (50+), so not new to them and stick with brands i trust and never let me down. many things are checked before assembly.
also i had the 9.5oz buffer in case of over pressuring being a magnum cartridge and 1st experience with a short mag in the ar platform. i had some in .473" rim that ruined the firing pin due to op'ing (243win), so didn't want that mistake again. i have a 7saum with same gas port size and gas length (different brands of barrels), so this is a learning curve with short mag ar's.
I can go be poor elsewhere, but I had to give this thing a try. It’s the PSA Sabre 10. I added the PRI Gasbuster CH, Harris bipod with QD mount, which is Lowlight’s all time favorite, a PA ACSS DMR scope, and the Surefire can. Only 40 rounds of M80 ball through it so far but not one failure and ejected at exactly 3 o’clock into a nice, neat little pile. I was able to keep it right at about 2 MOA at 100yds which is good for me because I’m not that good of a shot.
Seekins SPX Builder's Kit; custom Cerakote color Accuracy International Dark Earth; 22" Rock Creek SS 5R cut rifle barrel by Craddock Precision; SLR SL8 0.875" adjustable gas block; OSS/HUXWRX 7.62 muzzle brake, an amazingly effective yet not obnoxious muzzle device; Geissele 7.62 Super Charging Handle (SCH); JP Full Mass Operationg System (FMOS) bolt carrier group with High Pressure Bolt (a must with the 6.5 CM); TriggerTech Diamond trigger, set to 2 LB, riding on V7 titanium fire control pins; Seekins ambi safety; BCM MK 2 lower receiver extension with H3 buffer and JP polished recoil spring; Hogue oversize pistol grip; BCM SOPMOD buttstock; Magpul 20-RD magazine.
PSA receivers
Criterion 22" 6.5 CM
Magpul PRS Lite
CMC 2.5# trigger
Vortex PST Gen II 5-25x50
Harris Bipod
Criterion 22" 6.5 CM
Magpul PRS Lite
CMC 2.5# trigger
Vortex PST Gen II 5-25x50
Harris Bipod
This is becoming a favorite of mine for all around use and still holding good precision. Started as a lighter weight hunting build with a Proof CF 16” barrel that was a hammer, but that barrel hated a suppressor. So I fell back on a RA Ultramatch for the heavy flutes to help with weight that’s becoming my go to rifle now.
- Holosun 509t green mrds
- A10 suppressor
- Adm delta 20 moa mount
- 16” Ultramatch
- Superlative gas block .750
- Geissele SD-E trigger
- B5 Precision-
- Fab defense FDE bi pod
- Cmmg zeroed mk3 lpk
- Lmt mws buffer system
- Warhammer FDE charging handle
- BCM qd sling mount
- GroveTec Sling
- Magpul K2+ FDE grip
- FDE dust cover
- Ggp AR10 builder kit OD green
- RCA bcg
- Trijicon 3-18 Tenmile
- Ariska offset and plate
i have that same barrel and it shoots great. what recoil parts (and weights) are you using?
when shooting i used factory hornady 123sst and amax ammo. shot once then shot a second time, thought i missed so went and checked and found that the 2nd shot was almost exactly in the 1st (just slightly oval). that cbi barrel is a keeper for sure!
I am using a KAK Industry BCG and the standard PSA buffer but I have an adjustable gas block up front that I tuned to give just enough gas to hold open on an empty mag. Muzzle Brake is an AR-Stoner. I was using Hornady 130gr ELD Match the picture is with RL15 and I have a batch with Varget I need to test as well.
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Also, one thing I wound up doing was putting some shims between the barrel and the upper receiver to get the feed ramps a little closer. Used an Aero Precision Barrel Shim Kit LR-308; they managed to go behind the index pin without me having to cut them like I have seen in some videos.
so far only factory ammo in all of my ar 6.5creeds. in the ar 260rem i shoot the 130edl-m match ammo as there wasn't any 123's at the time.
