That spacer would work too. I’ve used those to pin standard A2 flash hiders on 14.5’s. It’s a little overkill for a FH in the 2.7" range.
For those interested, the 3 prong warcomp is the same length as the 249 saker. Looks like it should work with the BEM solid washer.
So, the Dead Air flash hider will work. BUT you have to use basically all the provided shims. It comes with a thick one, a bunch of mediums and one very thin. I measured to the bolt face with a plastic rod that measures exactly 16. Using just about all the shims provided, I’m a hair past 16 OAL 
https://imageshack.com/i/poXBX6XSj
https://imageshack.com/i/pmhdhsHVj
https://imageshack.com/i/pmxm6wOBj
That’s what I will be rolling with.
If you’re willing to sacrifice over 2 inches of barrel length and a significant amount of velocity why not just consider say a 11.5" sbr’d gun for example? I’m just curious because you’re not really gaining much ballistically compared to a shorty, but you’re giving up a decent amount from a full length carbine. IMO it would be better to have a short upper and a full length upper to serve dedicated roles instead of kind of doing each with just one in between. Unless you’re just doing it to avoid the NFA, in which case truck on brotha. [emoji869]
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^ This. I already have a few SBR’d shorties. This would be deemed a “full length” with the shortest possible barrel length that would allow it when pinned.
To the question about the gas port size, I measured my Noveske 13.7" CL at roughly 0.086" before I assembled it a year or two ago. I run it with an SLR adj gas block so I can’t really comment on whether it runs okay in stock form.
Have been super happy running it suppressed (SF RC 1) and unsuppressed with the SLR though.
I have a 13.7 track barrel build with a BE Myers 249F I got from Weapon Outfitters. I confirmed its over 16" when I got it back from them. They timed it with a prong at 12 o’clock. Great folks who do clean work. Anyway, I know the question came up “why go with 13.7” when your almost at 11.5". The answer? You get like 95% of the bennifit of a 11.5 SBR without the tax stamp:
11.5" with Silencerco adapter, 13.7"/249F, 16.1"/A2:
I’m a believer in having multiple guns. If you just had the ability for one AR, I think a strong argument could be made for a 13.7". Velocity loss over a 16"? Who cares? If you need to reach out over 400 yards grab a bigger caliber. Mine currently has a A5H0. Still have to try it with some heavier buffers but even with the H0 recoil isn’t bad at all, its a 223 for goodness sakes. Shoots like a carbine 16" with a H2 and a A2 FH.
3 shots at 100yards prone with bipod and scope:
I agree, but why not just run 16" barrel with no muzzle device? Its the same length as 13.7/14.5 pinned guns and your 16" are all usable barrel. I think you could make a strong case that most muzzle devices are not needed for a 556 AR, they just look cool.
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Are you being funny/ironic? Can’t tell if your serious.
I’m serious. If you want shortest legal overall length why not just do a 16 with no muzzle device. Unless you need a suppressor mount.
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I think most folks would want at least some blast mitigation.
For suppressor users, it’s nice to mount the can further back than a 14.5 or 16 would allow.
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Hell no.
The ADCO KAC spacer
I know this is an old thread, but I’m looking at doing a 13.7 build with the SOLGW Nox. Can you tell me if the Pyro clears the Geissele rail without the ADCO spacer? The Nox should be long enough to reach 16.1” OAL but I’m not sure if a Sandman K will still clear the rail.
Thanks,
-Dan
The Pyro will clear w/o the spacer, but you’ll probably still need it because you’d still have to account for some of the length you might lose when you thread on the device. Best to install the Nox and then measure the entire length to be sure you hit 16". If not, you’ll need the spacer.
Thank you, Sir!