I needed to include my calibers as 7.62x39 and 308, only running x39 with subs and supers and 308 supers only. Gas port sizing needs to meet a minimum diameter to supply gas on carbine length gas system to reliably run subsonic suppressed and that's where adjustable gas block comes into play...
All my guns have adjustable Gasblocks as I run suppressed 100% time, if it’s not properly gassed it will beat my guns to death running full power ammo as I learned this a long time ago with 308 AR 10. I believe in opening the gas port and installing adjustable Gasblocks to run either supersonic...
Lol a band-aid, its over gas systems and running suppressed to keep from beating your gun to death! All gas guns will run smoother and more reliable when changing out ammo loads and running suppressor.
I have built plenty of x39 uppers and have found what works 100%. Diamondback barrels, black rifle arms complete bcg, standard ar-15 spring and h2 buffer, superlative arms adjustable Gasblock! Drill gas port to 2.80mm if you plan on running subsonic ammo suppressed if not leave it and just...