The KAK Industry K-SPEC Bolt Carrier Group (brand part no. 425-0507-003) is a full-auto, M16-profile BCG chambered in 5.56 and finished in flat dark earth and dark earth tones to match a coyote or FDE-furnished AR-15 build. Building the BCG to M16 rather than semi-auto carbine profile means it carries the additional mass of the M16 carrier, which several shooters find helps smooth out recoil impulse and cycling on a semi-auto rifle. KAK’s K-SPEC design refers to the company’s own recoil-focused bolt and carrier geometry, engineered around reducing felt recoil and speeding up follow-up shots compared to a standard mil-spec BCG. It is built as a complete, ready-to-install group rather than a set of individual bolt and carrier parts.

Key Specifications

• Bolt face and dimensions machined for 5.56 AR-15 builds.
• Built to M16 carrier profile for additional reciprocating mass.
• Finished in flat dark earth/dark earth tones.
• K-SPEC design is engineered around reduced felt recoil and faster follow-up shots.
• Sold as a complete bolt carrier group, ready to install.

Frequently Asked Questions

Is this a full M16-profile carrier? Yes, it uses the heavier M16 carrier profile rather than a standard semi-auto carbine carrier.

What does the K-SPEC design change versus a standard BCG? KAK engineers the K-SPEC geometry around reducing felt recoil and speeding up follow-up shots.

Buy the KAK K-SPEC Bolt Carrier Group

Smooth out your AR-15’s cycling with KAK’s recoil-focused BCG. Order this KAK Industry bolt carrier group from our AR bolt carrier group selection, and our Lubbock, Texas team will get it shipped fast.