New AR based SBR

[KTR03]

Hey Gang,

So I have an odd situation - a problem that we should all want to have. I got a form 1 back from our ATF friends for an LMT lower. I had forgotten about it, and now get to decide what to build. Here is my issue: I have the following SBRs: ps90, 9mm AR, 300 BO AR, 5.56 AR, Sig 553, Sig 553R, Sig 551. So in terms of pistol calibers, sub calibers, and intermediate calibers, I am pretty much covered.

I was thinking I could do a 458 Socom, 50 beowolf or something like that, but I don't have a burning use for one of those. Was also thinking a Mk 18 would be cool. I could also do a 22LR, but that seems like a waste. If you all had an SBR lower and your core needs/wants are taken care off, what would you get? I know, this is a totally bourgeois angst "problem" but would still like some suggestions.

Thanks,

[fledge]

6.8 spc. Make it an SBR hog gun. 8.5, 10.5, 12.5, you pick.

[drtywk]

6.8 spc. Make it an SBR hog gun. 8.5, 10.5, 12.5, you pick.

This^^^! Keep in mind that 12.5" is the optimal barrel length for 6.8spc, per the testing that was conducted by a few .mil organizations. 12.5" maximizes the muzzle velocity in a semi-auto platform and also allows for greater expansion of the round.

[eodinert]

I'm kind of in the same boat, but I made a Mk18, because Mk18.

[drtywk]

Another idea would be a 10.4" HK416. Some of the early guns used LMT lowers.

[KTR03]

starting to lean towards a Mk 18. You guys thinking Daniel Defense or someone else?

D

[drtywk]

DD, but you may want to wait and see what Geissele's MK18 URG-I will look like and cost before you move forward. It should have the contract MK18 DD barrel, but it will come with the G Airborne Charging handle and MK18 sized MK16 rail. Some pics of the test guns are out there if you search for them.

[SteyrAUG]

starting to lean towards a Mk 18. You guys thinking Daniel Defense or someone else?

D

Look at the Colt 6945. When I began thinking about my Mk18 project that is where I ended up. Pretty much just added a SOPMOD stock and done.

[czgunner]

The 12.5” 6.8 SPC is a pretty great way to go.

[Achilles11B]

Another vote for 6.8 here. If it’s me,
I’d build a high-quality upper that would sit on the SBR’ed lower for HD purposes and use the 5.56 upper for training.