Love that movie. Well my English teacher would be very ashamed of me right now
Help me choose my 5.56 SBR Upper - DD or Geissele
- Thread starter Glassaholic
- Start date
DD just released the RIS III if you’re willing to wait/search to find one. That being said, having spent time behind the mk18 and a Geissele 10.3 gun at work, I prefer the Geissele. As does every one of my coworkers lol.
I use a DD Mk18 CQBR upper on a Colt M4a1 lower setup at work. I like it, very reliable with a standard buffer spring and H2 buffer.
Check out Centurion Arms if you haven't already.
11.5in FBI, Hammer Forged Barrel, Carbine
Centurion's hammer-forged barrel process leaves an extremely smooth and consistent surface on the inside of the barrel, that gives it pinpoint accuracy.
centurionarms.com
DD is on crack with their pricing. Hopefully it brings the pricing down on the RIS 2 rail. At least Geisseles tardo pricing gets cut by 20-30% a few times a year. Hopefully Geissele can get their shit together.
I’ve had a 14.5 pinned upper before and really liked it. Wanted something smaller (shorter) this time but funny you should mention that because I’ve been in touch with Craddock about a barrel in the 14.5” class and waiting to hear what they may be able to do.
Here’s a 14.7 I just built. The barrel was a 16” CLE Douglas Recon contour, with a little smaller profile past the gas block. I had my local smith cut it down for me. It’s a touch heavy, but balances and handles nicely. I’ll be running a Sig 5.56 SLX-C can on it when it gets out of jail, so it won’t be too unwieldy. I think it will end up being my go to 5.56 rifle for most things.
Interestingly enough, certain barrel/ammo combinations in 12” range run as fast as they do in 14.5”. So if you’re looking to keep it shorter, keep that in mind too.
One example that you can just watch/listen to. Plenty of threads etc that confirm same thing if you care to dig into it. But In general, yes, you lose a little. Like 50 fps on average. Which is practically nothing. A few different factory loads will still expand out to 300 yards from 11.5”. Our special operations guys run the H&K 416, 10.4” barrels. If it’s good enough for them, chances are it’s good enough for us, lol. Depends on objective. For 250 yards and in, I can’t see what a 14.5-16” gets you other than jammed up in a hallway.
If you jump ahead to about the 8 1/2 minute mark it will do the 12 1/2 inch Springfield Saint and then immediately afterwards the 14 1/2 inch Daniel defense. The 12 1/2 inch was actually five 5fps faster in the first run. Again there are so many variables. To do an apples to apples comparison you would really need to cut down the same barrel with the different ammo selections. The whole point, is that you can get some pretty decent velocities out of some of the shorter barreled options.
Had a visual of a guy with the front of his rifle punched through a section of drywall
I would not be looking for 14.5 to replace a 11.5 or shorter; however, I am thinking of a 14.5 to replace my SPR with 18" barrel. I'd be curious how much of a difference 14.5" makes compared to 18". If I'm looking at an "effective" range of 600 yards and in, and assuming both the 18" and 14.5" offer the same accuracy, then even at 2400fps (for Mk262 77gr SMK) I'm still well above supersonic at sea level at 600 yards. Given that, outside of "energy", what else am I missing?
Good point on recoil and how smooth everything is with the longer barrel and gas
Lol... Reminds me of a running gag at work:
"I waited 12 months for the $200 tax stamp to be approved for my 10" mk18 for when I have to do CQB around the house because my 16" is too unwieldy. When I got out to the range, it was too loud, so I bought another $200 tax stamp and waited another 12 months to get a suppressor to quiet it down. The extra length isn't bad at all: just about what a 16" would be unsuppressed."
My KAC 16" suppressed is a dream. Quiet and very low recoil. Amazing.
I like the look of the geissele handguards, would do one of those with an 10.5 or 11.5 barrel. Bonus points if it's the bronze looking FDE finish.
After much agony and internal debate I decided on the DD Mk18, I almost went with the Geissele for MLOK and 11.5” length but after mounting everything up the RIS II rail really grew on me.
Way to rain on my parade
But seriously, that suppressor (Ultra 5) is from my 300BLK and I was intending on picking up a Dominus SR; however, you do bring up a good point that I will need to wait, God knows how long, for Brandon's ATF to approve my privileged use stamp once I decide on the Dominus.I was about to put my Geissele up for sale, but now you have me thinking twice about my decision to got with the DD 10.3...
if you like the mk18 rail, pick up an 11.5 barrel. it won't look as cool cuz of the gap between the can and hand guard, but it's an option.
you'll have to pull the hand guard apart anyways for an agb, so you can use that time to put in a 11.5.
i prefer my 11.5 DD over my mk18 10.3
i prefer my 11.5 DD over my mk18 10.3
Helps to know people, just found a TBAC Dominus SR and hoped won’t have to wait to long with efile.
I’ve always understood the DD 10.3 to be ported for both suppressed and unsuppressed use without an AGB, have you found different?
Since you decided on the 10.3, the best suppressor for that upper (currently) is the rc2.Way to rain on my parade
I was about to put my Geissele up for sale, but now you have me thinking twice about my decision to got with the DD 10.3...
Own a DD with 10.3" barrel. Run it with a Dead Air Sandman S and never found the need for an AGB (and I shoot lefty, so I'm more sensitive to gas blow back). I think I have a Geisele spring and an H2 or H3 buffer and the gun runs like a top shooting mostly XM193 or PMC X-TAC.
i have the huge gas port on my 10.3 from 10 years ago. i forget the size and i never pin gauged it. judging from what orhers have said, my gas port is from the over sizing days according to the timeframe of when i bought it. i have 2 dd mk18 factory srbs that came with the magpul furniture and metal dust cover.
Even with the DDM4 handguard and RC2 on my LMT 10.3 there's a slight gap, but whatevs.
Much LMT, potentially not poor, am beer.
0.070" or 0.072" works very well with M855 ammo and H2 buffer. Unsuppressed sends casings go out at about 4 o'clock year-round. Suppressed (RC2) sends them at about 2-3 o'clock.
