Recently I got a BCM Pistol Lower from Grant. This week my BCM upper with 11.5 hammer forged barrel and Daniel Defense Omega rails arrived. I've added the Sig Brace to this and MBUIS. Today I shot a couple of hundred rounds of Federal 5.56 193 and function was perfect except 1 time the bolt didn't lock back on last round (using Pmag). I was very pleased with accuracy and was hitting 4" square steel from 100 yards with iron sights from bench with about 80% hits. I popped on my scope from another AR (the American Defense quick disconnect scope mounts are awesome). With the scope I was getting right at 2" groups at 100 yards with the Federal 193 and maybe 1 1/2" with Federal Fusion - (I've never had superb accuracy with the Fusion in any of my AR's - do others?) I want to run some match ammo to see if I can get into 1 MOA. Ultimately this is destined to wear an AimPoint T1 so super accuracy isn't needed.