FosTech Outdoors manufactures this complete bolt carrier group with a standard full-auto M16 cut, engineered to work with the Echo AR-II and Echo Sport platforms.
Bolt Assembly: The bolt is shot peened and magnetic particle inspected with marking. It is machined from 9310 alloy steel and supports .223 / 556 / 300BLK compatibility. The hardened tool steel extractor is shot peened, paired with a Viton Mil-Spec extractor O-ring and three Mil-Spec gas rings. All components feature black nitride finish.
Bolt Carrier: Built from 8620 steel in a heavy profile M16 style design, preferred for most AR-15 builds. Grade 8 gas key screws are properly torqued and staked to Mil-Spec. The 4130 steel gas key carries a black nitride finish.
Additional Components: The 4140 steel cam pin and 8740 steel firing pin are both finished in black nitride. The firing pin is centerless ground and hard chrome plated, with a total weight of 11.6 ounces.
100% USA made.
