MAGAZINE AMERICAN RIFLE 450BM 90633 Manufacturer Model Number: 90633 Manufacturer: Ruger Model: American Rifle Magazine Caliber: 450 Bushmaster Type: Accessory-Magazines Item Type: Accessory Finish: Black Shipping Weight: 0.4 Feature: Also works w/ 243,308, & 7MM08 Optic Adjustable Objective: false Optic Reticle Illuminated: false