Description
This KAK AR-15 bolt carrier group is the K-SPEC Enhanced model with downward gas vents, dual ejectors, and angled carrier rail cuts, in a chrome-lined phosphate finish. It is a right-hand, M16 full-auto-profile BCG for 5.56 NATO and .300 Blackout.
The two standard gas-relief ports are relocated from the ejection-port side to the underside of the carrier, in the magazine feed-lip channels, with two additional emergency relief ports on the bottom. Angled rail cuts are meant to move debris and fouling into non-critical areas. Dual ejectors use mil-spec ejectors and springs (no proprietary parts), with ejector holes centered on the lugs.
The 8620 carrier and 9310 bolt are ground to .0002 in. tolerances on the surfaces. Permatex is used between the gas key and carrier. Weight is 11.5 oz. This down-vent K-SPEC is not the side-vent K-SPEC (MO-425-0512-005) and not a DBC carrier. Steels and finishes are listed below.
Key specs
- Brand: KAK Industry
- Type: K-SPEC Enhanced AR-15 BCG, down vent, dual ejector, sand cuts
- Caliber: 5.56 NATO / .300 Blackout
- Profile: M16 full auto
- Finish: chrome-lined phosphate
- Carrier: 8620 steel, rails/bolt runs/gas bores ground to .0002 in., chrome-lined phosphate
- Bolt: 9310 steel, outside diameters ground to .0002 in., MPI, phosphate
- Firing pin: 8740, Swiss turned, heat treated, precision ground, chrome plated
- Cam pin: 4140, Swiss turned, heat treated, phosphate
- Extractor: 4140, fully machined, phosphate
- Extractor pin and ejector: S7 tool steel, ground, heat treated
- Gas key: 4130, T25 Torx, hydraulically staked, chrome-lined phosphate, Permatex on the mating surface
- Weight: 11.5 oz
- Patent: US 12,474,132 B2
- Manufacturer part number: MO-425-0512-003
- Made in the USA
Made in the USA by KAK Industry.