AR-15 Upper Receivers for .450 Bushmaster
These upper receivers will ensure you won’t get a casing of .450 Bushmaster stuck in your ejection port. Oversized around the ejection port, but otherwise mil-spec for reliable big-bore function.
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Aero Precision Assembled XL Upper Receiver for Big Bore AR-15 – Enlarged Ejection Port
AR-15 Upper for Big Bore Calibers - .450 Bushmaster, .458 SOCOM, .50 Beowulf If you're planning a big bore build for your AR-15, one area that often goes overlooked is...2 Options
These upper receivers will ensure you won’t get a casing of .450 Bushmaster stuck in your ejection port. Oversized around the ejection port, but otherwise mil-spec for reliable big-bore function.
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