M4e1 upper - very accurate - Aero Precision M4E1 Threaded 11.5in 5.56 w/ATLAS R-ONE Handguard Upper Receiver with Flash Hider

Great upper on AR pistol build. Put this on an AERO pistol lower and set this up for primary purpose CQB and out to 300 yards. Given the 11.5 inch barrel, maximum velocity and energy for that distance is optimal out to that distance with 62 grain, but that's just my two cents. Very accurate and solid build for a person seeking a sub $500 upper. I would put this up against BCM and some of your other premiere brands.