This Aero Precision Big Bore Upper receiver comes assembled with the ejection port and forward assist installed. Since this is a true big bore upper, this receiver is a great match for your next big bore build. Built from high quality and high strength aluminum, this Aero Precision Big Bore upper receiver will perform time and time again for your 458 SOCOM, 450 Bushmaster or 6.5 Grendel build. Place your trust in J-5 Tactical Supply and purchase this quality assembled Aero Precision Big Bore Upper made right here in the U.S.A.
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