Brn-4(R) Bolt Assembly - Brn-4/Hk416 Bolt Assembly

Replacement or spare Bolt Assembly for the Brownells BRN-4A(R). Completely assembled with ejector and extractor. Black nitride finished exterior makes for an extremely hard and durable part. Compatible with HK416 and MR556 rifles. Nitride finish Complete assembly includes extractor and ejector Extractor features black insert with o-ring for positive extraction 5.56x45mm NATO / 223 Remington bolt face Magnetic particle inspected 9310 tool steel Mfg: Brownells