Primary Weapons Systems Mod 2 Bolt Catch AR-15 Black. The checkering on the top portion of the bolt catch allows for the shooter to achieve and maintain solid contact with the bolt catch under manipulation. Specifications for Primary Weapons Systems Mod 2 Bolt Catch: Manufacturer: Primary Weapons Systems Color: Black Finish: Black Handle Color: Black Features of Primary Weapons Systems Mod 2 Bolt Catch Enhanced surface area on the top and bottom portion of the release paddle Works with most AR-15 forged and billet lower receivers Not compatible with AR-10/SR-25 receivers Cast AISI 8620 Per ASTM A-732 Package Contents: Primary Weapons Systems Mod 2 Bolt Catch Primary Weapons Systems PWS Mod 2 Bolt Catch Fits AR-15 Black