So, thinking of doing a 12.5", my first of this length. I'm considering a "mini precision" type build with the appropriate optic to be debated later. Question is on the gas system for those who have used 12.5's, carbine or does anyone utilize a mid length? This would be initially on a pistol lower and maybe later an SBR'rd one. I was originally looking at a 11.5" but already have a BCM pistol. Obviously, a quality SS barrel, maybe a Bartlein? I threw around the idea of 6.5G or 6mm ARC but didn't want to get into another caliber right now.

There's no illusions of SHTF, end of the world use, etc, just a fun gun to enjoy like most of the others.