This CMMG roll pin holds the bolt catch in an AR-15 lower receiver. Bolt catch roll pins are easy to damage or lose during a build, so it is worth having a spare on the bench. It is a standard-size steel pin from a manufacturer that has been making AR parts since 2002.
- Brand: CMMG
- Type: Bolt catch roll pin
- Fits: AR-15
- Size: 3/32 in. x 1/2 in.
- Manufacturer part number: 55CA547
