MAG AR-556 MPR 450BM 5RD 90679 | BLACK Manufacturer Model Number: 90679 Manufacturer: Ruger Model: AR-556 MPR Caliber: 450 Bushmaster Type: Accessory-Magazines Item Type: Accessory Firearm / Accessory Capacity: 5 rd. Shipping Weight: 0.3 Optic Adjustable Objective: false Optic Reticle Illuminated: false