American Built Arms Company Pro 5.56mm Bolt Assembly Silver/Black Small ABA5.56B. For superior reliability these Bolt Carrier Groups feature a nickel boron coated bolt and extractor each crafted from heat-treated steel. A nickel boron coated bolt...
American Built Arms Company Pro 5.56mm Bolt Assembly Silver/Black Small ABA5.56B. For superior reliability these Bolt Carrier Groups feature a nickel boron coated bolt and extractor each crafted from heat-treated steel. A nickel boron coated bolt...