Radian Weapons AR-15 Extended Bolt Catch Nitride. Specifications for Radian Weapons AR-15 Extended Bolt Catch: Manufacturer: Radian Weapons Gun Model: AR-15 M16 Color: Black Finish: Anodized Country of Origin: USA Package Contents: Radian Weapons AR-15 Extended Bolt Catch What firearm models does the manufacturer say Radian Weapons AR-15 Extended Bolt Catch is compatible with? The manufacturer says that Radian Weapons AR-15 Extended Bolt Catch is compatible with AR-15 M16Radian Weapons R0323: AR-15 Extended Bolt Catch Nitride