Brenton USA Long-Load Rifle Magazine AR-15 300 Blackout 17 Rounds Black. Using .025'' thick wall 410 stainless steel and heat treated for superior strength and durability. Brenton magazines are also chemically treated against corrosion (Q-P-Q-35). Interior dimensions measure a generous 2.315 +/- .002 for long loads. These magazines will last you a lifetime. Specifications for Brenton USA Long-Load AR-15 300 Blackout 17 Rounds Rifle Magazine: Manufacturer: Brenton USA Color: Black Finish: Black Fabric/Material: 410 Stainless Steel Magazine Capacity: 17 Round Caliber: .300 AAC Blackout Gun Make: AR Platform Gun Model: AR-15 Quantity: 1 Features of Brenton USA Long-Load AR-15 300 Blackout 17 Rounds Rifle Magazine All Weather Black Nitride Protective Coating QuietFit body profile SmoothFeed Anti Tilt Follower Removable 5rd LimitBlock .025in Thick 410 Stainless Steel Body LongLoad Max COAL: 2.310' Package Contents: Brenton USA Long-Load AR-15 300 Blackout 17 Rounds Rifle Magazine What firearm models does the manufacturer say Brenton USA Long-Load AR-15 300 Blackout 17 Rounds Rifle Magazine is compatible with? The manufacturer says that Brenton USA Long-Load AR-15 300 Blackout 17 Rounds Rifle Magazine is compatible with AR-15Brenton USA LL-1-30B-17RD: Long-Load Rifle Magazine AR-15 300 Blackout 17 Rounds Black