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SR25 Upper Compatibility
- Thread starter POGPride
- Start date
7 of these in-stock as I am writing this. For anyone who missed the SR-25 cartel uppers I think this is them… just sent them a message to confirm.
Edit. These are the SR-25 cartel uppers. Ready to ship.
www.operationparts.com
Edit. These are the SR-25 cartel uppers. Ready to ship.
HTX Concepts SR-25 Pattern Billet Upper Receiver
HTX Concepts SR-25 Pattern Billet Upper Receiver (SR25UPPER)
www.operationparts.com
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I really like what those guys are doing,7 of these in-stock as I am writing this. For anyone who missed the SR-25 cartel uppers I think this is them… just sent them a message to confirm.
Edit. These are the SR-25 cartel uppers. Ready to ship.
HTX Concepts SR-25 Pattern Billet Upper Receiver
HTX Concepts SR-25 Pattern Billet Upper Receiver (SR25UPPER)
Has anybody figured out a solution for handguards that doesn't involve GB.
I been able to get several SR-25 URX 3.1 and URX 4 from operation parts.
Big Tex ordinance, and roof top defense get stuff from time to time also.
Yep. Needs to be test fit say for sure… who would have though Danielle Defense and Wilson combat we’re not standard AR 10 cut
but credit where credit is due… PSA has made a few notable products in recent years… this might be one.
Just a data point for others referencing this. I am working on a very similar build. I used the SMF tactical upper and MARS-H, but I was not so lucky. The lines match up nicely (like you said, a little trimming makes it even better, but I'm happy with the aesthetic. Got the gun together last night and found a functional problem with the upper/lower combo. The bore of my SMF upper sits lower than the receiver extension in my LMT lower. The BCG is not able to move freely between the upper and lower.I did some fitting work to the SMF tactical upper to get the lines to match up better with the LMT lower. Really, I just broke some edges and trimmed some overhang but it made a huge difference and I am really happy with how it turned out.
Again… this did function without modification. I just wanted the lines to match up a bit better.
View attachment 7815857View attachment 7815858View attachment 7815859View attachment 7815860
Basically I just put sharpie on the upper (Like layout fluid) and scribed some line, then use files to remove extra material. SO long as you take you time and have a some file (And a few different shapes) this is no difficult. It just requires patience.
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Here is some shots during and after paint. (Paint is Aervoe brand and the color is Sand) Oh and that LMT blem marking is
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I'll get an LMT (and maybe Stag) upper on the gun and confirm that the SMF upper is the problem. Maybe they've changed their design, maybe I ended up with a lemon.
Don’t sleep on those Cartel uppers… they are available and the fit is exactly what we were all looking for. They are expensive… but worth it IMO.
Some folks on reddit were a little disappointed. Sounds like they purposefully mismatched the lines so that they couldn't be mistaken for Knights uppers?
I was following along during their development with much interest, but 600 bones is a lot for a stripped upper.
It is… I am sure you can tell the difference and 600 is a lot. But the fit IMO is great. I have mine on a knights lower now.
sounds like the SMF is a lemon. I ran an SMF TAC-10 on a MWS lower and they worked beautifully. I bet SMF will make it right. Centurion Arms is also redeveloping their MK11 receivers and will have ambi controls, etc. I'm thinking it'll drop this year.
I would definitely reach out to SMF. The people I spoke with on the phone were incredibly nice. I am sure they would take care of it.
For what it’s worth, I got ahold of a Troy upper that was made for the CSASS trials. They were intended to be backwards compatible with M110/Mk11 lowers and fit on my MARS-H lower like a glove.
I have a LaRue 762 lower kicking around that I want to use for something other than a LaRue upper. Ever since Mark pushed the prices up to $2000 I've been wanting to build with something else.
Thinking I should just grab a Stag stripped upper and build off that. The SR25 cartel uppers are a little pricey imo.
Thinking I should just grab a Stag stripped upper and build off that. The SR25 cartel uppers are a little pricey imo.
Do the Larue ultimate uppers take a standard barrel format, or are they proprietary?
I also got a couple blowout Larue lowers and am debating what upper route to take.
I also got a couple blowout Larue lowers and am debating what upper route to take.
My understanding from other posters here is that you've always been able to rebarrel a LaRue with a typical large frame AR barrel but I'm not 100% on this. It seems there's more differences in the carriers than there is with the barrel extensions.
LaRue I thought claimed that their extensions were unique to them but others here have rebarreled LaRue large frames.
You should be able to use any SR-25 slant cut on a Larue. Just note Armalite AR-10A upper holes (.274") are smaller than KAC - LMT - Stag (.277) and will need slight reaming.
Here are Knight and Larue uppers swapped on each others' lowers:
Stripped Stag-10 uppers are around $180:
Diamondback DB-10s around $100 (I think they're Armalite pin size -- they fit on both AR-10As and Bs):
Here are Knight and Larue uppers swapped on each others' lowers:
Stripped Stag-10 uppers are around $180:
Diamondback DB-10s around $100 (I think they're Armalite pin size -- they fit on both AR-10As and Bs):
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Here's a few pics of of an SR25 Cartel and a Genesis upper on a LMT Defender H lower. I did try a stag but didn't want to ream the pin holes as I'm running the forward controls pins (.280) otherwise the stag fit okay. I do think these two fit the LMT better.
SR-25 Cartel upper
Genesis Upper on LMT Defender H lower.
SR25 Cartel stripped on the table.
SR-25 Cartel upper
Genesis Upper on LMT Defender H lower.
SR25 Cartel stripped on the table.
Results of the stripped CSASS trials upper I posted earlier.
I was using an SR25 Cartel upper, which was fantastic, but I prefer the lines of the trials upper better.
Works great and no issues, not surprising since it was made to be backward compatible with SR25/Mk11/M110 lowers.
This might be a dumb question, but on the list for an MGL110, thinking I'm going to build the upper out instead of trying to use the Sabre10. What Can I use any rail on an SR25 Pattern upper? URX is unobtainable. So trying to figure out what my rail options are to look similar to the m110.
Samson is too long I believe and I dunno that I could stomach the look of either for what I'm going for. (m110) I spent most of the last 12 hours looking till 6:30am this morning actually lol. Just going to grab and LMT quad HTX barrel, gas block, and copy MMM's build with the griffin MGL110.Samson Star10
SLR Helix Quad
I know that Diamondback ships their lowers with pins, I also learned the hard way their bolt catch is proprietary to their lowers. Uppers can be ordered with either 16 or 18 TPI threads & their handguards come with both barrel nuts. I'm thinking real hard about an 8.6 blk pistol upper build, common sense should dictate that I just build a 300 blk based on ammo prices alone, then the added 338 can should make it a no brainier, you would think...
I tried the Samson, was not what I was looking for but length was good. I ended up putting it on a stag and selling the whole thing.
Knights SR25 rails pop up from time to time on operation parts but you basically have to be standing or get lucky to grab one. I got a URX 3.1 back when they were still easy to find. Secondary market is high but not as crazy as it was a year ago.
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I thought this add for an upper was interesting in that it states it will fit; Armalite Pattern Upper for Diamondback, LWRC, Daniel Defense, Stag etc. Lower Receivers
Is this an AR-15 product? All Troy shows are AR-15 uppers.
I assume it is an AR-10 upper so, I'm curious where you found it.
Sid, I traded a Criterion barrel to a guy from arfcom and tacswap. He's got a listing where he had two or three of them.
Yes, same pin sizes for KAC-LMT. The rear pin boss is correct for the KAC lower pocket, just a skoshi wide for the LMT (will probably need very light sanding).
Troy competed for a SOCOM MK 11 contract. They still carry a complete rifle but I don't know if they're releasing stripped uppers and lowers.
I'm building a 7.62 on an LMT MWS lower, waiting for John Scandale at Keystone Precision in Pennsylvania to contour a Krieger M24 blank. It will direct-mount an Allen Engineering AEM5-30 suppressor. She'll be heavy but I want this one for suppressed precision rather than swing-ability.
I see from your other thread you whack pigs and coyotes. I'd try a Lothar-Walther stainless Var-Tac barrel. My young nephew has gone all-in on 6.5 Creedmoor but I am old and invested in 7.62.
Yes, same pin sizes for KAC-LMT. The rear pin boss is correct for the KAC lower pocket, just a skoshi wide for the LMT (will probably need very light sanding).
Troy competed for a SOCOM MK 11 contract. They still carry a complete rifle but I don't know if they're releasing stripped uppers and lowers.
I'm building a 7.62 on an LMT MWS lower, waiting for John Scandale at Keystone Precision in Pennsylvania to contour a Krieger M24 blank. It will direct-mount an Allen Engineering AEM5-30 suppressor. She'll be heavy but I want this one for suppressed precision rather than swing-ability.
I see from your other thread you whack pigs and coyotes. I'd try a Lothar-Walther stainless Var-Tac barrel. My young nephew has gone all-in on 6.5 Creedmoor but I am old and invested in 7.62.
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Centurion Arms has released their KAC compatible large frame series (ambi).
Here ya go ......
MK11 7.62 Ambidextrous Billet Receiver Set
Mk11 7.62 Billet Receiver Set 7075-T6 aircraft aluminum compatible with standard AR Lower Receiver Parts. Components, material, and packaging made in the USA.
centurionarms.com
Looks like they're only sold as sets. Mixed manufacturer compatibility probably has the same issues as other SR25 pattern upper/lowers .Here ya go ......
MK11 7.62 Ambidextrous Billet Receiver Set
Mk11 7.62 Billet Receiver Set 7075-T6 aircraft aluminum compatible with standard AR Lower Receiver Parts. Components, material, and packaging made in the USA.
Yes, for now they’re only sold in sets. They are SR 25 pattern, so if they ever do sell just the upper then it’ll fit onto an LMT or Larue or SR 25 pattern lower.
I don't need nor want the lower, just the upper receiver.
If anyone needs an LMT MARS‐H lower for one of these concoctions pm me. Can confirm it works well with KAC M110 and Mk11 Uppers
