Magpul MAG568-BLK Enhanced AR Magazine Release Compatible w/ AR15/M4/M16 AR-Platform Black Anodized Black Aluminum $19.95
Del-Ton Inc RKT104 Heavy Mid-Length Rifle Kit 5.56x45mm NATO 16" Chrome Moly Vanadium Barrel 7075-T6 Anodized Aluminum Rec with A2 Flash Hider $393.36