CMMG ZEROED AR15 Bolt Catch Black. The CMMG ZEROED extended bolt catch features dual oversized extended paddles with a tactile machined surface. Steel construction with a durable finish makes for a robustly built component with excellent ergonomics for confident bolt catch operation every time. Specifications for CMMG ZEROED AR15 Bolt Catch: Manufacturer: CMMG Gun Model: AR-15 Color: Black Condition: New Package Contents: CMMG ZEROED AR15 Bolt Catch What firearm models does the manufacturer say CMMG ZEROED AR15 Bolt Catch is compatible with? The manufacturer suggests that CMMG ZEROED AR15 Bolt Catch is compatible with AR-15CMMG 55CA5FC: ZEROED AR15 Bolt Catch Black