Works great as a pistol upper! - Primary Weapons Systems MK111 MOD2-M, .223 Wylde, 11.85 in Upper Receiver

Finally decided which direction to go for my pistol build. Wanted something light weight and even though this is a little heavier than I originally planned, the long stroke piston doesn’t add too much weight. I liked the idea of this over the DI system. It's very high quality so far, accurate, and smooth running. I’ve only tested it indoors at 25 yards, but so far so good! PMC Bronze 55 grain runs great, but one light primer strike out of first 100; I’ve had this happen in another AR with same ammo, so I’m not faulting the PWS just yet. Frontier 75 grain worked great so far!