{ "@context": "https://schema.org/", "@type": "Product", "name": "KAK Industry DBC K-SPEC BCG | First BCG Built for FRT Triggers | AR-15", "description": "KAK Industry DBC K-SPEC Bolt Carrier Group - the first BCG engineered specifically for forced reset trigger use. Floating dead-blow weight in carrier tail eliminates bolt bounce, allowing a standard 3oz carbine buffer with any FRT. Tested with Hoffman Tactical Super Safety, AS Designs ARC-Fire, Atrius Development FRS, and Rare Breed FRT. 9310 steel bolt, M16 full-auto profile, dual ejectors, downward gas vents, chrome-lined, mag phosphate finish. Patent US 12,474,132 B2. $199.99.", "image": [], "brand": { "@type": "Brand", "name": "KAK Industry" }, "manufacturer": { "@type": "Organization", "name": "KAK Industry", "address": { "@type": "PostalAddress", "addressCountry": "US", "addressRegion": "MO" } }, "award": "Patent US 12,474,132 B2", "sku": "KAK-DBC-KSPEC-BCG", "mpn": "KAK-DBC-KSPEC-BCG", "material": "9310 Steel Bolt - 8620 Steel Carrier", "color": "Mag Phosphate / Chrome-Lined", "weight": "14.5oz", "countryOfOrigin": "US", "category": "Firearm Parts > AR-15 > Bolt Carrier Groups", "offers": { "@type": "Offer", "url": "https://www.artakedowntool.com/products/kak-industry-dbc-k-spec-bcg-frt-ar15", "priceCurrency": "USD", "price": "199.99", "priceValidUntil": "2026-12-31", "availability": "https://schema.org/InStock", "itemCondition": "https://schema.org/NewCondition", "shippingDetails": { "@type": "OfferShippingDetails", "shippingRate": { "@type": "MonetaryAmount", "value": "0", "currency": "USD" }, "shippingDestination": { "@type": "DefinedRegion", "addressCountry": "US" }, "deliveryTime": { "@type": "ShippingDeliveryTime", "handlingTime": { "@type": "QuantitativeValue", "minValue": 0, "maxValue": 1, "unitCode": "DAY" }, "transitTime": { "@type": "QuantitativeValue", "minValue": 2, "maxValue": 5, "unitCode": "DAY" } } }, "hasMerchantReturnPolicy": { "@type": "MerchantReturnPolicy", "applicableCountry": "US", "returnPolicyCategory": "https://schema.org/MerchantReturnFiniteReturnWindow", "merchantReturnDays": 30, "returnMethod": "https://schema.org/ReturnByMail", "returnFees": "https://schema.org/FreeReturn" }, "seller": { "@type": "Organization", "name": "The Takedown Tools", "url": "https://www.artakedowntool.com" } }, "additionalProperty": [ { "@type": "PropertyValue", "name": "FRT Compatibility", "value": "Hoffman Tactical Super Safety, AS Designs ARC-Fire, Atrius Development FRS, Rare Breed FRT - and similarly designed FRT systems" }, { "@type": "PropertyValue", "name": "Buffer Requirement", "value": "Standard 3oz carbine buffer - H2/H3 no longer required" }, { "@type": "PropertyValue", "name": "Dead-Blow Feature", "value": "Floating weight in carrier tail eliminates bolt bounce" }, { "@type": "PropertyValue", "name": "Bolt Material", "value": "9310 Steel - Magnetic Particle Inspected" }, { "@type": "PropertyValue", "name": "Carrier Material", "value": "8620 Steel - chrome-lined, ground to .0002 tolerances" }, { "@type": "PropertyValue", "name": "Carrier Profile", "value": "M16 Full-Auto" }, { "@type": "PropertyValue", "name": "Finish", "value": "Mag Phosphate - bolt and carrier; Chrome-lined - carrier internals and gas key" }, { "@type": "PropertyValue", "name": "Ejector System", "value": "Dual ejectors - S7 tool steel, mil-spec springs" }, { "@type": "PropertyValue", "name": "Gas Venting", "value": "Downward venting - relocated below mag feed lip channels" }, { "@type": "PropertyValue", "name": "Carrier Rails", "value": "Slotted angled sandcutter cuts for adverse conditions" }, { "@type": "PropertyValue", "name": "Firing Pin", "value": "8740 steel, Swiss turned, heat treated, chrome plated" }, { "@type": "PropertyValue", "name": "Cam Pin", "value": "4140 steel, Swiss turned, heat treated, phosphate" }, { "@type": "PropertyValue", "name": "Ejector Material", "value": "S7 tool steel - ground, heat treated" }, { "@type": "PropertyValue", "name": "Gas Key", "value": "4130 steel, chrome-lined, hydraulically staked, T25 torx" }, { "@type": "PropertyValue", "name": "Cartridge", "value": ".223 Rem / 5.56 NATO / .300 Blackout" }, { "@type": "PropertyValue", "name": "Weight", "value": "14.5oz" }, { "@type": "PropertyValue", "name": "Dimensions", "value": "7.7\" L x 1\" W x 1.4\" H" }, { "@type": "PropertyValue", "name": "Patent", "value": "US 12,474,132 B2" }, { "@type": "PropertyValue", "name": "Country of Origin", "value": "USA - machined in-house, Missouri" } ] } { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "What makes the KAK K-SPEC BCG different from a standard M16 BCG?", "acceptedAnswer": { "@type": "Answer", "text": "The KAK K-SPEC is the first BCG engineered specifically for forced reset trigger use. It contains a floating weight in the carrier tail that creates a dead-blow effect - eliminating bolt bounce that causes FRT malfunctions. This allows the rifle to function reliably with a standard 3oz carbine buffer instead of the H2 or H3 weights typically required for FRT builds. Additionally it features dual ejectors, downward gas venting, slotted angled carrier rails, and chrome-lined internals ground to .0002 tolerances - all in one package. Patent US 12,474,132 B2." } }, { "@type": "Question", "name": "Can I run a standard buffer with the K-SPEC BCG and an FRT?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. The K-SPEC&';s floating dead-blow weight in the carrier tail provides enough mass and shock absorption to allow a standard 3oz carbine buffer to work reliably with an FRT. This eliminates the need for heavier H2 or H3 buffer weights that are normally required to tune FRT builds. As with all FRT setups, individual firearms may require fine-tuning - but the K-SPEC is specifically engineered to make the standard buffer work where it couldn&';t before." } }, { "@type": "Question", "name": "Which FRT systems has the K-SPEC been tested with?", "acceptedAnswer": { "@type": "Answer", "text": "KAK Industry has tested the K-SPEC BCG successfully with the Hoffman Tactical Super Safety, AS Designs ARC-Fire FRS, Atrius Development FRS, and Rare Breed FRT. Similarly designed FRT systems should also work. Testing was conducted by KAK Industry as part of the patent development process." } }, { "@type": "Question", "name": "What is the dead-blow floating weight?", "acceptedAnswer": { "@type": "Answer", "text": "The K-SPEC carrier tail contains a floating weight that moves independently during the BCG&';s travel cycle. As the carrier reaches the rear of its travel, the floating weight continues forward, creating a counteracting force that eliminates bolt bounce - the primary cause of FRT malfunction on standard BCGs. This dead-blow effect is the core innovation of the K-SPEC and what makes it uniquely suited for FRT use." } }, { "@type": "Question", "name": "What cartridges is the K-SPEC compatible with?", "acceptedAnswer": { "@type": "Answer", "text": "The K-SPEC BCG is compatible with .223 Remington, 5.56 NATO, and .300 Blackout. It fits all standard AR-15 mil-spec uppers." } }, { "@type": "Question", "name": "Does the K-SPEC work suppressed?", "acceptedAnswer": { "@type": "Answer", "text": "Yes - and it is specifically engineered for suppressed use. The downward gas venting relocates gas ports from the ejection port side to underneath the carrier in the magazine feed lip channels, reducing gas blowback to the shooter&';s face. KAK&';s testing shows the down-vent design also reduces peak decibel levels when used with a suppressor. No additional tuning of the gas or recoil system is required to run suppressed." } }, { "@type": "Question", "name": "What is the dual ejector system?", "acceptedAnswer": { "@type": "Answer", "text": "The K-SPEC uses two mil-spec ejectors and springs rather than the standard single ejector. The dual ejector system increases ejection reliability and adds consistency to the ejection pattern - especially important in high-cyclic-rate FRT applications where inconsistent ejection is a common issue. Ejector holes are centered on the lugs to maintain bolt strength. Both ejectors are S7 tool steel, ground and heat treated." } }, { "@type": "Question", "name": "Is the K-SPEC made in the USA?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. The KAK K-SPEC is machined entirely in-house at KAK Industry&';s Missouri facility using Doosan machining centers, Tsugami Swiss turning, and FANUC robotics in an automated cell. In-house CMM inspection ensures consistent quality. 100% USA made." } } ] } #pw { font-family: &';DM Sans&';, sans-serif; font-size: 15px; line-height: 1.75; } #pw, #pw * { color: inherit; } #pw p, #pw li, #pw td, #pw div, #pw span { color: #111111 !important; } #pw h1, #pw h2, #pw h3 { color: #111111 !important; } #pw strong { color: #111111 !important; } #pw a { color: #b07a28 !important; text-decoration: none !important; } #pw a:hover { text-decoration: underline !important; } /* namespace: .kak */ #pw .kak-badge { display: inline-block !important; background: #b07a28 !important; color: #000000 !important; font-size: 10px !important; font-weight: 700 !important; letter-spacing: .12em !important; text-transform: uppercase !important; padding: 3px 10px !important; border-radius: 2px !important; margin-bottom: 14px !important; } #pw .kak-intro { font-size: 15.5px !important; color: #111111 !important; margin-bottom: 14px !important; line-height: 1.8 !important; } #pw .kak-h2 { font-size: 17px !important; 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font-size: 18px !important; font-weight: 300 !important; flex-shrink: 0 !important; } #pw .kak-faq-item[open] summary::after { content: &';x;&'; !important; } #pw .kak-faq-answer { padding: 0 0 16px !important; font-size: 14px !important; color: #444444 !important; line-height: 1.7 !important; } #pw .kak-links { list-style: none !important; padding: 0 !important; margin: 12px 0 0 !important; } #pw .kak-links li { padding: 7px 0 !important; border-bottom: 1px solid #eeeeee !important; font-size: 14px !important; } #pw .kak-links li:last-child { border-bottom: none !important; } #pw .kak-disclaimer { margin-top: 28px !important; padding-top: 16px !important; border-top: 1px solid #dddddd !important; font-size: 12.5px !important; color: #888888 !important; line-height: 1.6 !important; } KAK Industry A K-SPEC DBC BCG A First BCG Built for FRT Triggers A Patent US 12,474,132 B2 A USA Made 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. Patent US 12,474,132 B2 The K-SPEC&';s floating dead-blow carrier tail weight is a patented innovation - the first of its kind in the AR-15 BCG market. This is not a marketing claim. It is a granted US patent. The Problem Every FRT Builder Knows Every FRT on the market requires a heavier buffer - typically H2 or H3 - to function reliably. That extra weight slows bolt velocity enough for the FRT&';s reset mechanism to engage before the bolt returns to battery. Get it wrong and you get bolt bounce, failure to reset, or the trigger locking up. FRT builders spend hours tuning buffer weight, spring rate, and gas settings chasing reliability. The K-SPEC eliminates this. A floating weight inside the carrier tail creates a dead-blow effect - absorbing and counteracting bolt bounce mechanically, inside the BCG itself. Standard 3oz carbine buffer. No H weights. No tuning. Drop it in and run. 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: Hoffman Tactical Super Safety AS Designs ARC-Fire FRS Atrius Development FRS Rare Breed FRT 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 Bolt 9310 Steel - MPI tested, phosphate finish, .0002 tolerance ground Carrier 8620 Steel - chrome-lined, phosphate finish, .0002 tolerance ground Firing Pin 8740 Steel - Swiss turned, heat treated, chrome plated Cam Pin 4140 Steel - Swiss turned, heat treated, phosphate Ejectors S7 Tool Steel - ground, heat treated (dual) Extractor Pin S7 Tool Steel - ground, heat treated Extractor 4140 Steel - fully machined, phosphate finish Gas Key 4130 Steel - chrome-lined, hydraulically staked, T25 torx, torqued to spec Full Specs Platform AR-15 - all mil-spec uppers Cartridge .223 Remington / 5.56 NATO / .300 Blackout Bolt Material 9310 Steel - Magnetic Particle Inspected Carrier Material 8620 Steel - chrome-lined Carrier Profile M16 Full-Auto Finish Mag Phosphate - bolt and carrier exterior; Chrome-lined - carrier internals and gas key Ejector System Dual - S7 tool steel, mil-spec springs Gas Venting Downward - relocated to magazine feed lip channels Carrier Rails Slotted angled sandcutter cuts Dead-Blow Feature Floating weight in carrier tail - Patent US 12,474,132 B2 FRT Buffer Requirement Standard 3oz carbine buffer - H weights no longer required Weight 14.5oz Dimensions 7.7" L x 1" W x 1.4" H Country of Origin USA - machined in-house, Missouri Patent US 12,474,132 B2 KAK Industry Manufacturing - Missouri, USA The K-SPEC is machined entirely in-house at KAK Industry&';s Missouri facility using Doosan machining centers, Tsugami Swiss turning, and FANUC robotics in an automated cell with lights-out production capability. In-house automated CMM inspection processes ensure consistent quality on every unit. No outsourced components. No overseas machining. Every K-SPEC is made start to finish under one roof in the USA. Frequently Asked Questions What makes the K-SPEC different from a standard M16 BCG? The K-SPEC is the first BCG engineered specifically for FRT use. It contains a floating dead-blow weight in the carrier tail that eliminates bolt bounce - the primary cause of FRT malfunction. This allows a standard 3oz carbine buffer to work reliably with any FRT, eliminating the H2/H3 buffer weight requirement. It also features dual ejectors, downward gas venting, slotted angled carrier rails, and chrome-lined internals ground to .0002 tolerances. Patent US 12,474,132 B2. Can I really run a standard buffer with an FRT using this BCG? Yes. The K-SPEC&';s patented floating weight in the carrier tail provides the dead-blow effect that allows a standard 3oz carbine buffer to work reliably with FRT and active reset trigger systems. KAK Industry tested this with the Hoffman Tactical Super Safety, AS Designs ARC-Fire, Atrius Development FRS, and Rare Breed FRT. As with all FRT builds, individual rifles may require some fine-tuning - but the K-SPEC eliminates the buffer weight variable from that equation. Which FRT systems has the K-SPEC been tested with? KAK has tested the K-SPEC with the Hoffman Tactical Super Safety, AS Designs ARC-Fire FRS, Atrius Development FRS, and Rare Breed FRT. Similarly designed FRT and active reset systems should also be compatible. What is the dead-blow floating weight? The K-SPEC carrier tail contains a floating weight that moves independently during the BCG&';s travel cycle. As the carrier reaches the rear of its travel, the floating weight continues forward - creating a counteracting force that eliminates bolt bounce before it can interfere with the FRT&';s reset mechanism. This is the core of Patent US 12,474,132 B2 and what makes the K-SPEC uniquely suited for FRT use. Does the K-SPEC work suppressed? Yes - it is specifically engineered for suppressed use. Downward gas venting reduces blowback to the shooter&';s face and lowers the suppressed decibel report. No additional tuning of the gas or recoil system is required to run suppressed. The sandcutter carrier rails also handle the increased carbon fouling from prolonged suppressed fire. What cartridges does the K-SPEC support? .223 Remington, 5.56 NATO, and .300 Blackout. Fits all standard AR-15 mil-spec uppers. Is the K-SPEC made in the USA? Yes. Machined entirely in-house at KAK Industry&';s Missouri facility using Doosan machining centers, Tsugami Swiss turning, and FANUC robotics. In-house CMM inspection on every unit. 100% USA made from start to finish. 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.