Description
KAK AR-15 bolt carrier group is the unmarked chrome-lined phosphate model with a Carpenter 158 (C158) bolt, manufacturer part number MO-425-3312-003-OEM. It is a standard, right-hand, side-vent BCG for 5.56 NATO and .300 Blackout AR-15 builds.
The M16 auto-profile carrier is machined from aircraft/bearing-quality 8620 steel, heat treated, and ground, then given a chrome-lined phosphate finish. The bolt is machined from a single piece of Carpenter 158 steel, heat treated, precision ground, shot peened, and MPI inspected, with a phosphate finish. The C158 bolt is what sets this part apart from Carroll Arms’ other KAK chrome-lined phosphate BCG (MO-425-0512-001-OEM), which uses a 9310 bolt.
It uses an enhanced one-piece billet extractor with a phosphate coating, a phosphate cam pin, and an S7 tool steel ejector and extractor retaining pin. The firing pin is machined from 8740 to the mil-spec print, precision ground, and chrome plated. The 4130 gas key is chrome-lined phosphate, precision staked on a hydraulic staking machine, and installed with Permatex gasket sealant. Carrier key screws are KAK T25 drive, Grade 8, and heat treated. The carrier is unmarked (no logo). Made in the USA by KAK Industry.
Key specs
- Brand: KAK Industry
- Type: standard AR-15 bolt carrier group, unmarked (no logo)
- Platform: AR-15, right hand
- Caliber: 5.56 NATO / .300 Blackout
- Carrier: M16 auto profile, 8620 steel, chrome-lined phosphate, side vent
- Bolt: Carpenter 158 (C158), single piece, heat treated, precision ground, shot peened, MPI, phosphate finish
- Firing pin: 8740, mil-spec print, precision ground, chrome plated
- Extractor: one-piece billet fully machined enhanced extractor, phosphate coated
- Cam pin: phosphate
- Ejector and extractor retaining pin: S7 tool steel
- Gas key: 4130, chrome-lined phosphate, hydraulically staked, Permatex gasket sealant
- Carrier key screws: KAK T25 drive, Grade 8, heat treated
- Manufacturer part number: MO-425-3312-003-OEM
- Made in the USA
See also: KAK BCG phosphate chrome lined (9310 bolt, MO-425-0512-001-OEM) | KAK
WARNING: Cancer & Reproductive Harm – www.P65Warnings.ca.gov