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  • Walker Defense Research Research Steel Bolt Carrier Group BCG, 5.56mm / .300 BLK, DLC, Flat Dark Earth, FDE-DLC-BCG-556
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Product Info for KAK Industry K-SPEC Enhanced AR-15 6.5mm Grendel Bolt Carrier Group

The K-SPEC BCG combines multiple key features focused on increasing the reliability of your AR15 style firearm no matter if you are running suppressed or unsuppressed, and regardless of conditions. The K-SPEC is a truly plug and play BCG that will accommodate whatever configuration your mission requires.image

For those running suppressed, the K-SPEC requires no additional tuning or tweaking of the gas or recoil systems to run reliably. Like all KAK BCGs, the K-SPEC is machined to the M16 full auto profile.

WARNING: California`s Proposition 65

Specifications for KAK Industry K-SPEC Enhanced AR-15 6.5mm Grendel Bolt Carrier Group:

Manufacturer: KAK Industry
Color: Black
Finish: Phosphate
Carrier Material: 8620 Steel
Bolt Material: 9310 Steel
Caliber: 6.5mm Grendel
Gun Make: AR Platform
Gun Model: AR-15
Hand: Right
Weight: 11.5 oz
Condition: New
Cam Pin Material: 4140 Steel

Features of KAK Industry K-SPEC Enhanced AR-15 6.5mm Grendel Bolt Carrier Group:

  • Reduced Peak DB Report
  • When used in conjunction with a silencer, the gas redirect produces a quieter report
  • Slotted Angled Carrier Rails - For enhanced functionality in adverse and rugged conditions such as sand, mud, dirt, and grime. These rail cuts are designed for debris disbursement, resulting in ultra-high functionality in the toughest conditions, including suppressor fouling and foreign contaminates. Strategically located angle cuts in the rails result in fouling and debris being moved into noncritical areas that are not in contact with the receiver and do not affect the function of the firearm. aka sandcutter
  • Downward Gas Vents - In an effort to reduce the amount of debris and gas vented towards the shooters face, the two standard gas relief ports have been relocated from the ejection port side of the K-SPEC carrier and placed underneath, in the magazine feed lip channels. Two additional emergency relief ports have also been added to the bottom of the carrier to mitigate structural damage in the event of a case head separation. Testing has shown that venting the gasses through the magazine well has no negative impact on the feeding or function of the magazine nor ammunition, and any added heat is negligible.
  • Dual ejectors - The K-SPEC dual ejector system uses mil-spec ejectors and springs that require no proprietary parts. Ejector holes are centered on the lugs to avoid any reduction in strength of the bolt. The dual ejector system increases the ejection reliability and adds consistency to the ejection pattern. AS Industry has been manufacturing dual ejector bolts for the AR10/LR308 platform for over a decade and has used that experience to create a durable and reliable dual ejector system for the AR15 platform.

Package Contents:

  • KAK Industry K-SPEC Enhanced AR-15 6.5mm Grendel Bolt Carrier Group

KAK Industry K-SPEC Enhanced AR-15 6.5mm Grendel Bolt Carrier Group Orderable Models

List of Orderable Models

  • KAK Industry K-SPEC Enhanced AR-15 6.5mm Grendel Bolt Carrier Group, Down Vent, Sand Cuts, Phosphate, Black, MO-425-0512-015 , MPN: MO-425-0512-015 , UPC: 811163035033 , Code: 3KE-BCG-KSPECB1CG-MO-425-0512-015
  • KAK Industry K-SPEC Enhanced AR-15 6.5mm Grendel Bolt Carrier Group, Side Vent, Sand Cuts, Phosphate, Black, MO-425-0512-017 , MPN: MO-425-0512-017 , UPC: 811163036016 , Code: 3KE-BCG-KSPECB1CG-MO-425-0512-017
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Last updated 2026-08-20 UTC.