Gorilla Machining GM-15 Stripped Upper Receiver is machined from 7075 T7 Aluminum forging. Featuring M4 feed ramps, this upper receiver is machined to Military Specifications & Standards and can be used with multiple calibers on the AR-15 platform. This upper receiver comes in type III hard coat black anodize. The Tactical M4A4 upper receiver comes with Ar-15 charging handle , forward assist and dust cover.
- Precision machined to correct Mil-Specs from 7075 T6 Forgings
- Anchor Harvey Upper Receiver Fully MIL-STD M4A4
- Mil-Std 1913 Rail for mounting optics and accessories
- Machined for use with barrels that use an M4 barrel extension
- Includes Mil-Spec Forward Assist with heat treated tool steel pawl, with press fit and pinned cap
- Hard Coat Anodized per Mil-A-8625F, Type III, Class2
- Dry Film Lube on interior bore per Mil-Specs