AR-15-556-barrel-stainless-complete-ar15-upper-assembly Published March 21, 2020 at 1000 × 1000 in AR-15, 5.56 NATO, 16″ Stainless Mid-Weight Barrel, 1:8 Twist, Mid-Length Gas System with 15″ MLOK Rail Complete AR-15 Upper receiver with 16″ Stainless Mid-Weight Barrel, mlok rail, 5.56 NATO ← Previous