Alex Pro Firearms M16 Bolt Carrier Group Sp4 Silver 5.56 223 300Blk

The Alex Pro Firearms APF Armory M16 Bolt Carrier Group SP4 5.56/223/300 BLK Silver delivers rugged performance for demanding rifles with SP4-coated components machined to military specifications and proudly Made in the USA. This BCG features a hybrid Diamond Like Carbon coating that blends extreme hardness with notable ductility, minimizing friction and wear while requiring minimal lubrication, a breakthrough validated by testing in extreme environments from Alaska's cold to desert conditions in the Middle East. The SP4 coating provides outstanding lubricity and durability, enabling longer lifespans and reliable cycling with little to no maintenance. The bolt is Carpenter 158 shot-peened and heat-treated with SP4 coating, the carrier uses SAE 8620 heat-treated steel with full-auto specification and SP4 coating, and each critical part—extractor, firing pin, gas key, and cam pin—is precision-machined and treated for longevity, including chrome-lined bore on the hand-polished bolt carrier and a staked gas key with gas rings. This combination enhances wear resistance and reliability across calibers, making it an ideal choice for shooters seeking a high-performance, long-lasting bolt carrier group suited for rigorous field use and extreme conditions.