Grid Defense Complete Upper Receiver .300 Blackout 10.5 inch Pistol Length 4150 Steel Light HBAR Barrel 1-8 Twist 10.5 inch Hand Guard A2 Flash Hider

Grid Defense Complete Upper Receiver .300 Blackout 10.5 inch Pistol Length 4150 Steel Light HBAR Barrel 1-8 Twist 10.5 inch Hand Guard A2 Flash Hider. 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