Open Box Return – ASC 5 Round 450 Bushmaster Magazine for AR-15

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A Reliable Magazine to Feed Your .450 Bushmaster “Thumper”

The .450 Bushmaster is a popular hunting cartridge, but a good magazine can be hard to come by.   With the straight-wall design, supporting each round for reliable feeding can be a challenge.  Luckily, ASC has it all figured out with this 5-round magazine for your “Thumper” AR-15.  Featuring supporting ribs to keep cartridges in place, and preventing malfunctions, this magazine is a great choice to feed your big-bore hunting rifle.

Designed to Prevent Double-Feeds

While originally intended to fit a standard AR15 magazine, improper geometry and follower design can lead feeding issues and rifle malfunctions for .450 Bushmaster. By creating a proprietary internal bracing system and laser-welding it into a 410 stainless-steel body, this magazine prevents rounds from getting misaligned and prevents double-feeds.

The enhanced system of this AR-15 magazine also ensures reliability over thousands of rounds, not just the first shots at the range.


  • Caliber: .450 Bushmaster
  • Capacity: 5 Rounds
  • Body Material: 400 series stainless steel
  • Spring Material: 17-7 Stainless Steel Wire
  • Follower Material: Polymer
  • Follower Color: Black
  • 17-7 Stainless Steel Wire Spring
  • Anti-Tilt Follower
  • Weight: 4.56 oz
  • Finish: Matte Black

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