Bootleg 16" Partial Upper, Mil Spec M4 Upper Receiver, 15 PicMod HG, A2 Flash HiderUpper: Machined from forged 7075 Aluminum Mil Spec Hard Anodizing Forward assist eliminated for weight saving and reduced snag risk Lightweight design 6. 2 oz stripped (. 8 oz lighter than a mil spec upper receiver) 1. 7 oz lighter than a mil spec upper receiver with hardware installed Captured dust cover door pin eliminating the need for the E clip Increased barrel mounting circumference maintaining a solid barrel receiver interface Interference fit