Windham Weaponry Upper Receiver for 450 Bushmaster

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This Upper receiver is available stripped or assembled with an Ejection Port Cover and Forward Assist Assembly, and ready for a new barrel. CNC Machined from 7075T6 Aircraft Aluminum. The 450 requires a larger ejection port opening to allow proper ejection of the 450 casing. This quality Upper is finished in Hard Black Anodize for a non-reflective matte surface and protection against corrosion and laser engraved with .450 Thumper for safety . It features an integral Picatinny Rail that will accept a wide variety of Rear Sights, Optics, or the A4 Removable Carry Handle.


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