Griffin Armament MK1 AR-15 Anti-Rotation Assembled Upper Receiver Black

Griffin Armament MK1 AR-15 Assembled Upper Receiver The MK1 AR-15 Anti-Rotation Assembled Upper Receiver comes with the port door and forward assist already installed. Forged from 7075-T6 aluminum, this assembled upper is precision machined to mil- spec M16/M4 specifications and features M4 feedramps. The MK1 AR-15 Anti-Rotation Assembled Upper Receiver features Griffin's anti-rotation interface, which is compatible with Griffin's Anti-Rotation rails. These uppers will also work with milspec rails, but the anti-rotation rails require these uppers. Specifications Anti-Rotation Tabbed Interface Locks Griffin Rails into the Upper 7075-T6 Aluminum Mil-A-8625F, Type III, Class2 anodized finish M4 feedramps Forward assist & ejection port door included (assembled)