SBR AR15 barrel length?

[sgms18]

7in bbl, .125 gas port, 1.5in shorter than pistol, subs only, must have can to cycle consistantly

[Retooferab]

10.5" pistol position port. I only shoot subs and it works every time! 8.6gns of N110 with 220gn SMKs.

[carcass]

7.5" of my own design, 0.125" gas tap at 4.7" I have some issues with cycling when loading short rounds (to make mags stack properly). I am currently trying to work out a load that will cycle 100%.

When I load rounds to 2.20" OAL I have no cycling problems but the rounds don't stack well in the mag and I can't get FA fire to work properly when more than about 15 rounds are loaded in a mag.

It will not cycle subsonic without a suppressor.

[Titleiiredneck]

8" 300 wtf, pistol gas, swr omega 300 stainless. The can is as long as the barrel :/

[dvcguns]

TP555 9.5" / Pistol port
Runs sub 220SMK/168SMK with or without can 100%

Will be moving to supers soon

[Fritzcat]

10 1/2" pistol gas, TP555-3 way gas block with lever, thread 1/2"-28, YHM Wraith XL. 147gr to 180gr with Blue Dot and 200gr to 220gr with Lil Gun.