It features a floating weight in the carrier tail that creates a dead-blow effect to eliminate bolt bounce, allowing use of a standard 3 oz carbine buffer (instead of heavier H buffers) with FRDs.
Specs include an 8620 steel carrier with hard chrome finish (rails, bolt runs, and gas bores ground to .0002" tolerances); 9310 steel bolt (ground to .0002", MPI’d, shot-peened, phosphate finish); chrome-plated 8740 firing pin; phosphate 4140 cam pin and extractor; S7 tool steel ejector and extractor pin; and a chrome-lined phosphate 4130 gas key staked with T25 fasteners. Weight is 14.5 oz.
KAK chrome 5.56/300 Blackout bolt carrier group