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 a Charging handle , forward assist and dust cover.
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