Ruger® AR-556® MPR 450 Bushmaster Proper Magazine Alignment Tech Tip
This Ruger Tech Tip addresses a common feeding issue with the AR-556 MPR in .450 Bushmaster. It explains that improper magazine loading, specifically tapping rounds to the rear, can cause the cartridge rim to snag on the bolt catch. The solution involves ensuring the top round is positioned slightly forward, about the thickness of a penny, from the rear magazine wall for reliable feeding.









