Grid Defense Complete Upper Receiver .300 Blackout 16 inch Pistol Length 4150 Light HBAR Barrel 1-8 Twist 14 inch M-LOK Rail A2 Flash Hider Flat Dark

Grid Defense Complete Upper Receiver .300 Blackout 16 inch Pistol Length 4150 Light HBAR Barrel 1-8 Twist 14 inch M-LOK Rail A2 Flash Hider Flat Dark. 300 Blackout Upper Receiver is an excellent addition to any high-quality AR build. Each of these Grid Defense AR15 Upper Receivers comes with an M-LOK free float handguard that allows for the attachment of accessories and allows your barrel to shoot more accurately. The Mil-Spec Grid Defense .300 Blackout Rifle Upper Receiver is constructed from 7