Description Evolve Weapons Systems Full-Auto M16 Bolt Carrier Group, Chrome This Evolve Weapons Systems bolt carrier group features a corrosion resistant hard chrome finish. They are individually high pressure tested and feature a C158, magnetic particle inspected, bolt. It features a phosphate 4140 extractor as well as a phosphate, chrome lined gas key and sprinco springs! All Evolve Weapons Systems products come with a 100% Lifetime Warranty! Features: Hard chrome finish Sprinco Springs 8620 steel carrier 4130 steel gas key Properly staked grade 8, domestically sourced gas key screws Carpenter 158 steel bolt 4140 steel extractor
