KAK Industry DBC K-SPEC BCG | First BCG Built for FRT Triggers | AR-15

The KAK Industry DBC K-SPEC BCG is the first bolt carrier group ever engineered specifically for forced reset triggers. Every other BCG on the market was designed for standard semi-auto use — FRT builders adapted them as best they could, stacking buffer weight on buffer weight to tune reliability. The K-SPEC eliminates that problem entirely with a patented floating dead-blow weight in the carrier tail that allows any FRT to run on a standard 3oz carbine buffer — the one that came in your rifle.

The buffer tuning problem is the number one reliability complaint in the FRT world. KAK patented the solution.

Confirmed FRT Compatibility — Tested by KAK Industry

KAK tested the K-SPEC with the major active reset systems on the market as part of the patent development process:

Similarly designed FRT and active reset systems should also be compatible. As with all FRT builds, individual firearms may require fine-tuning — but the K-SPEC is specifically engineered to eliminate the buffer weight variable from that equation.

What Makes the K-SPEC Different

• Floating dead-blow weight — carrier tail — the core innovation. A weight inside the carrier tail moves independently during the BCG cycle, counteracting bolt bounce at the rear of travel. This is what allows a standard buffer to work with an FRT. Patent US 12,474,132 B2
• Dual ejector system — two S7 tool steel mil-spec ejectors replace the standard single ejector. Increases ejection reliability and consistency in the ejection pattern — critical in high-cyclic-rate FRT applications where single ejectors can be marginal. Ejector holes centered on lugs maintain full bolt strength
• Downward gas venting — standard gas ports relocated from the ejection port side to the underside of the carrier in the magazine feed lip channels. Less gas to the face, reduced blowback, quieter suppressed report. Two additional emergency relief ports added at the bottom for structural protection in case of case head separation
• Slotted angled carrier rails (sandcutter) — strategically angled cuts move carbon fouling and debris into non-critical areas away from the upper receiver contact surfaces. Designed for adverse conditions including sand, mud, dirt, and prolonged suppressor fouling
• 9310 steel bolt — MPI tested — 9310 is the highest-strength steel used in AR-15 bolts. Every bolt receives magnetic particle inspection, the most reliable method for detecting internal defects. Outside diameters ground to .0002 tolerances
• 8620 steel carrier — chrome-lined — chrome lining on the bolt run, rails, and gas bores provides a harder, more durable surface for long-term cycling. Ground to .0002 tolerances throughout
• Permatex gas key seal — applied between gas key and carrier mating surface, preventing gas leakage at the key joint. Gas key is chrome-lined, hydraulically staked, and torqued to spec with T25 torx fasteners
• Suppressor-optimized no-tune — runs suppressed or unsuppressed with no changes to gas or recoil system. Zero additional tuning required

Component Steel Breakdown

Full Specs

Frequently Asked Questions

Pairs With

• Hoffman Tactical Super Safety — Active Reset Selector
• Kabuto FRT — Metal Ambi Selector ($129.99)
• Trigger Supply AR-15 Anti-Walk Pins ($24.99)
• AR-15 Buffers — H2, H2.5, H3 (for standard BCG builds)
• Best FRT Triggers for AR-15 — 2026 Buyer's Guide
• Are FRT Triggers Legal? — State-by-State Guide
• How Forced Reset Triggers Work — Complete Explainer

As with all FRT and active reset trigger builds, individual firearms may require fine-tuning for optimal reliability. KAK Industry's testing results are based on their testing conditions and may not reflect every possible rifle configuration. It is the buyer's responsibility to safely test and tune their specific firearm. Comply with all applicable local, state, and federal laws regarding firearm parts and accessories. Patent US 12,474,132 B2.