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APF Armory LW Bolt Carrier Group AR-15 5.56x45mm SP4




Alex Pro Firearms (APF) is proud to introduce BCGs featuring SP4, a hybrid DLC (Diamond Like Carbon) coating that is the result of over a year in development. SP4 combines high hardness (2500-3500 HV) with ductility to remain tough without exhibiting brittleness vs common PVD/DLC type thin film coatings. SP4 reduces friction and improves wear resistance for metal components which provides a longer life span and requires minimal maintenance with little to no lubrication. It has been tested to -44 degrees F in the mountains of Alaska, and has been tested in the both Iraq and Afghanistan with no lubrication, which is a huge advantage in desert environments and extreme cold. SP4 has passed the ASTM 85 (Annex 1) Salt Fog test and provides the best hardness/lowest friction co-efficient while maintaining the ability to “move” with the metal it is protecting. Includes a hand polished bolt carrier with a chrome lined bore and staked gas key, bolt with gas rings, firing pin, cam pin, and firing pin retaining pin.


Made In United States of America

Product Information

Cartridge 5.56x45mm NATO
Color Black
Finish SP4
Material Steel
Mil-Spec or Commercial Commercial
Country of Origin United States of America
Compatible With

Delivery Information

Shipping Weight

0.695 Pounds


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