Replacement or spare part for BRN-4 bolt carrier groups. Chrome plated finish to provide corrosion resistance and lubricity. Use only with the BRN-4 bolt carrier group. Mfg: Brownells
Replacement or spare part for BRN-4 bolt carrier groups. Chrome plated finish to provide corrosion resistance and lubricity. Use only with the BRN-4 bolt carrier group. Mfg: Brownells