Hey all - I'm running an AAC SPR M4 (which weighs 18 oz) on an 18" PSA .223 Wylde upper. I have no illusions about getting under 2MOA out of a PSA factory gas gun, but 2 or even 3 MOA is all I need out of this gun, which is for coyote at 150, maybe 200 yards, or less. I had a heck of a time...