Ruger AR-556 MPR 5rd Magazine .450 Bushmaster Black

This is a replacement or spare 5-round magazine designed for the Ruger AR-556 platform and chambered for .450 Bushmaster. It is intended to support straight-walled big-bore rounds using an internal bracing system and a follower designed to control the round stack for reliable feeding. The magazine is made in the USA and is produced under the Duramag product line for Ruger-compatible AR-15 pattern rifles.

Key Specifications

• The magazine holds 5 rounds.
• Caliber: .450 Bushmaster.
• Designed to fit Ruger AR-556 style magazines wells.
• Finish listed as Black Matte.
• Includes enhanced anti-tilt black polymer follower.
• Includes chrome silicon springs.
• Interior overall length (OAL) is 2.316 +/- .002 (per manufacturer text).
• Country of origin: US.
• Units per box: 1.
• Package/Shipping weight listed as 0.3.

This magazine provides a practical, factory-compatible spare or replacement for AR-556 owners who use .450 Bushmaster ammunition. With components intended to control round alignment and reduce feed issues—such as the anti-tilt follower and chrome silicon spring—this Duramag unit is positioned for reliable service in compatible AR-15 pattern rifle platforms. Its compact 5-round capacity and USA production make it a straightforward option for owners seeking a purpose-built magazine for big-bore straight-walled cartridges.