The ATI M4 stripped upper receiver will accept all standard mil-spec AR components and lower receivers. Start your build today at the best price online from GrabAGun!
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M4 Stripped Upper Receiver
M4 Stripped Upper Receiver Features The ATI stripped upper receiver is forged from T7075 aluminum and features M4-type feed cuts inside for reliable feeding! This receiver also features T-marks on the picatinny rail. The receiver is black finished and stripped so you can complete your AR build your way! Compatible with standard mil-spec AR lower receivers and components. M4 Stripped Upper Receiver Specifications Cartridge: 223 Remington,5.56 mm NATO Finish: Black Make: AR-15 Style: Stripped