OP, I noticed your rear BUIS could actually be moved a couple rail slots to the rear. That would increase your sight radius a little bit and would probably help you get the most accuracy out of your irons.
Good shooting by the way.
Thanks for the review, hk.
I can’t for the life of me figure out why a quality manufacturer like DD over gasses their mk18’s.
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Because of the lowest common denominator ammo users.
Well I know that’s the ‘reason’ but in my opinion that’s ‘bush’ league shit if you know what I mean. LMT, colt, BCM, noveske, and KAC don’t seem to feel the need to over gas as far as I know.
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Thanks for the suggestion, I will check that out.
ETA: Fixed, thanks for pointing that out.
KAC also doesn’t make a 10.3/10.5 and neither does BCM. I do agree that designing your rifle around that worst ammo made is a poor decision. I don’t use Tula but .083 seems a little excessive even for underpowered ammo IMO.
I’m trying to decide whether to get one of these, or wait until BCM has the 11.5" uppers back in stock
You mean “bush” league like my colt 10.5 or the 25 others I have seen go back and forth to colt because they couldn’t figure out the right gas/spring ratio. I’ll take my DD Mk18 upper with a little extra gas any day.
Wasn’t trying to ruffle anyone’s feathers. I love DD, I’ve just seen so many reports of malfunctions/premature wear from mk18s and answer is always “so it will shoot tula.” THAT is what SEEMS bush league to me. But maybe I just don’t have all the necessary info.
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From my personal experience, 10.5/10.3 guns are always going to be a compromise. I would rather have it overgassd and run a variety of ammo. Your needs may vary. Owning both a DD 10.5 and DD 11.5 I would always pick the 11.5 but carry the 10.5 with confidence.
That’s cool. And I respect your view on the topic. But for me?.. I view a 10.5 as a CQB gun that should be able to be fired fast and accurately. In my experience with over gassed shorties, I’ve found them to be a pain in the ass to shoot fast. The bounce me off target too quickly and are flat out not enjoyable to shoot.
When I first did an SBR, I had this crazy over-gassed 11.5 Sabre barrel. (This was years back before we knew much about port size and buffers.) Anyway, I ended up NEVER shooting the thing because I just thought SBRs were miserable to shoot, and that was that.
No, he means bush league as in not like the LMT 10.5 which runs Tula at .071" (at least with the standard carbine buffer that LMT ships all their rifles with :p). I think the DD is a great rifle, but you better do some upgrading to the spring and buffer if you don’t want your rifle beating the hell out of itself. My personal feelings are that DD took the easy way out and chose overgassed instead of more R&D.
Pappabear just rolled one of the LMTs out. We shot it with the CAR buffer (unknowingly), and that sucker was rough. It runs great with an H3 using full powered .223. (we don’t have any weak ammo to try it with)
Yea… I don’t think that the carbine buffer is ideal for your standard ammo :fie:. I attempted a quick 15 round mag dump with a std car buffer (suppressed) and it would only get one round out before it had a f2f. Changed out the buffer to an H2 and it ran through without any more bolt bounce issues (which i assume is what was happening with the carbine buffer). Rate of fire was still a little quicker than I prefer hah.
I don’t fret a lot about an AR being over or under gassed. If it is a bit over gassed you can pretty easily swap buffers / springs. The recoil from a gas operated 5.56 rifle is never going to be all that bad, regardless of the gas system.
I understand that your opinion may differ on this subject if you’re a competition shooter, are recoil sensitive or simply a pussy. 
(No, I am not calling anyone in this thread a pussy…)
Everyone has different use cases and/or scenarios where you could argue it is good or bad one way or another. It is what it is, as my hunting partners would say…
I run another one with 10.3 DD BARREL and RISII. I have a Vltor A5 in it and it has run fine with different weight buffers. I run a M4-2000. Mark and I played with different weights and I can’t remember the entire variety because they all worked. Mark might remember what weights we tinkered with on the suppressed version.
So should a blue Sprinco spring and H3 buffer help keep unnecessary wear to a minimum? It cycles IMI M855 fine, just wondering if it is enough to tamp down accelerated bolt wear/stress.
DD MK18 Upper on a Colt Lower.
I run a H2 buffer and a Sprinco Blue. Runs great.
Beautiful setup, you should be fine running that buffer, as everyone has already told you.
OP, I am not one that is interested in SBRs…just not my thing.
But that is one titties SBR. Just fantastic.
Damn, ARs are my cocaine. I friggin’ love ARs…