Ruger® AR-556® MPR 450 Bushmaster Proper Magazine Alignment Tech Tip

Published on November 22, 2021
Duration: 1:15

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.

Quick Summary

To prevent feeding malfunctions in the Ruger AR-556 MPR .450 Bushmaster, ensure the top round is loaded with its front edge forward from the rear magazine wall by approximately the thickness of a penny. This alignment prevents the cartridge rim from catching the bolt catch.

Chapters

  1. 00:00Introduction: AR-556 MPR .450 Bushmaster Magazine Loading
  2. 00:16The Malfunction Issue: Rim Catching Bolt Catch
  3. 00:44The Solution: Proper Round Alignment

Frequently Asked Questions

What causes feeding malfunctions in the Ruger AR-556 MPR .450 Bushmaster?

Feeding malfunctions can occur if rounds are tapped to the rear of the single-stack magazine. This can cause the cartridge rim to catch on the bolt catch, preventing smooth chambering. Proper alignment is key.

How should I load the magazine for my Ruger AR-556 MPR .450 Bushmaster?

Ensure the top round is positioned forward from the rear wall of the magazine by about the thickness of a penny. This prevents the cartridge rim from snagging the bolt catch and ensures reliable feeding.

What is the recommended fix for magazine feeding issues with the .450 Bushmaster AR-556 MPR?

The recommended fix is to adjust the position of the top round. It should be forward from the rear magazine wall by roughly the thickness of a penny, allowing for smooth chambering and preventing bolt catch interference.

More Training & Techniques Videos You Might Like

More from RugerFirearms

View all →