Other Details Manufacturer: Magpul Industries Manufacturer Part Number: MAG556-BLK Accessories: With Window Action: Semi-Auto Caliber/Gauge: .223 REM/5.56 NATO Capacity: 30 Cartridge: .300 AAC Blackout Color: Black Finish: Black Fit: AR Rifles Make: AR-15 Make/Model: AR-15 Material: Polymer Model: M3 Model Fit: AR-15 Product Type: Magazine Quantity: 1 Subcategory: Rifle Magazines