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KAK Industry, K-SPEC Enhanced, Bolt Carrier, 8620 Steel Carrier, Dual Ejectors, Side Vent, Sand Cuts, 6.5 Grendel, Phosphate Finish, Black - SKU: MO-425-0512-017 - UPC: 811163036016
Product Description
The KAK Industry K-SPEC Enhanced 6.5 Grendel Bolt Carrier Group (MO-425-0512-017) is a duty-grade, highly modified feeding mechanism engineered specifically for high-reliability AR-15 builds chambered in 6.5 Grendel (Type II .136" bolt face depth). Designed around KAK Industry's innovative K-SPEC geometry, this BCG incorporates modern enhancements to improve extraction, ejection force, gas management, and reliability in adverse field conditions.
Precision-machined from 8620 steel for the carrier and 9310 alloy steel for the bolt, the assembly features a classic MIL-SPEC heavy phosphate exterior with a chrome-lined interior carrier bore and gas key. The bolt head is upgraded with dual plungers/ejectors to provide uniform spring pressure against heavy 6.5 Grendel brass, ensuring authoritative, reliable ejection trajectories and preventing casing drop-backs into the receiver.
The carrier body features aggressive exterior sand cuts along the guide rails to channel away dirt, carbon, and debris, preserving smooth cycling in harsh environments. Standard side-venting gas ports ensure proper gas pressure relief while keeping blowback directed away from critical internal components.
*Armorer Bench Notes & Real-World Staging Guidance:
Fitment Matrix: Direct drop-in fit for standard AR-15 upper receivers paired with 6.5 Grendel barrels featuring a Type II (.136" deep) bolt face cavity. (Also compatible with 6 mm ARC barrels utilizing standard 6.5 Grendel bolt specs).
- Verify host upper receiver and barrel assembly are clear, magazine removed, and chamber visually and physically confirmed empty.
- Inspect bolt assembly to ensure extractor pin, dual ejectors, and gas rings (staggered gaps) are fully seated and functional.
- Lubricate carrier guide rails, bolt body, and cam pin generously with heavy duty gun oil prior to installation.
- Insert the assembled BCG into the upper receiver channel, verifying the gas key mates cleanly over the gas tube without binding.
- Perform manual charging handle pull-backs and headspacing/locking checks using appropriate 6.5 Grendel gauges prior to live fire.
Key Features
- Dual Ejector Bolt Architecture: Twin ejector pins distribute spring tension evenly for positive, consistent 6.5 Grendel brass ejection.
- Enhanced Sand Cuts: Machined relief channels along the carrier rails clear carbon, sand, and fouling during cycling.
- 8620 Carrier & 9310 Bolt Steel: Premium heat-treated alloy steel construction handles heavy cartridge pressures without lug shearing.
- Chrome-Lined Carrier Bore & Key: Hard-chromed interior surfaces resist gas erosion and simplify bolt tail cleaning.
- Heavy MIL-SPEC Phosphate Finish: Durable oil-retaining phosphate coating guards against corrosion and harsh environmental exposure.
- Type II (.136") 6.5 Grendel Specification: Precision-machined bolt face designed for true 6.5 Grendel and 6mm ARC chamberings.
Product Specifications
- Brand: KAK Industry
- MPN: MO-425-0512-017
- SKU: MO-425-0512-017
- UPC: 811163036016
- Caliber Compatibility: 6.5 Grendel (Type II .136") / 6mm ARC
- Platform Compatibility: AR-15 / M4 Upper Receivers
- Carrier Material: 8620 Tool Steel
- Bolt Material: 9310 Alloy Steel
- Gas Venting: Side Venting
- Special Features: Dual Ejectors, Sand Cuts, Chrome-Lined Bore
- Finish/Color: Manganese Phosphate / Black
