KAK Industry AR-15 Bolt Carrier Completion Kit - Includes Chrome Firing Pin, Nitride Cam Pin, Carbon Steel Firing Pin Retaining Cotter Pin, Mil-Spec Spec Tolerances - MO-304-1010-003 / 811163035804
Product Description
Completing a custom bolt carrier build, overhaul tracking array, or dedicated field service emergency framework requires high-grade internal components built to perfect military specification print tolerances. Standard loose or sub-spec internal parts accelerate internal friction degradation, causing structural shearing or sudden ignition primer light-strikes on your bench. The ** KAK Industry® AR-15 Bolt Carrier Completion Hardware Pack (MO-304-1010-003 / 811163035804)** completely flatlines these internal timing and cycling failures. It supplies a premium **three-piece drop-in drivetrain hardware upgrade bundle** precision engineered straight from factory blueprints.
Proudly machined and heat-treated to professional-grade endurance specs in the United States by KAK Industry, this internal enhancement kit replaces the most heavily stressed wear points inside a standard AR-15/M16 bolt carrier group. The package features a **premium precision-ground carbon steel firing pin** treated with a hard, ultra-slick industrial chrome plating to resist high-temperature primer blast gas corrosion. It also includes a **heavy-duty steel cam pin** encased in a smooth, friction-reducing matte black liquid nitride skin, alongside a traditional **manganese phosphate-treated spring steel retaining cotter pin**. Ready to finalize your next custom bolt assembly, this turn-key small parts group upgrades your weapon reliability parameters straight from your workbench.
Engineered to drop seamlessly into any standard mil-spec 5.56 NATO, .223 Remington, or .300 Blackout bolt carrier channel, this factory-calibrated completion kit ensures absolute mechanical synchronization directly from your workspace bench.
*Armorer Bench Notes & Real-World Bolt Group Assembly Guidance: The KAK Industry MO-304-1010-003 internal component kit arrives workspace ready, containing 1x chrome-plated steel firing pin, 1x matte black nitrided cam pin, and 1x heavy-duty steel firing pin retaining pin. UNIVERSAL AR-15 BOLT CARRIER GROUP INTERFACE MATRIX: Every small component in this drivetrain pack is engineered natively, strictly, and dimensionally to drop into **any standard standard mil-spec AR-15, M16, or M4 bolt carrier body**. *Bore Caliber and Bolt Group Cross-Fitment Checklist:* This hardware assembly fits perfectly across standard weapon calibers using standard-dimension carriers on your bench, including **5.56x45mm NATO, .223 Remington, .300 AAC Blackout, 6.5mm Grendel, and 6mm ARC platforms**. *PCC Incompatibility Warning:* Note that this standard layout will **NOT fit specialized blowback 9mm Luger pistol-caliber carbine (PCC) bolt groups**, which utilize completely custom proprietary solid firing pins and omit cam pin slots. Armorer Workbench Custom Staging Sequence: 1. Visually and physically confirm your host long gun is completely clear of live ammunition, the magazine is separated, and the charging handle tracking slot is verified empty and safe. 2. Push out the lower receiver frame pins, separate the upper receiver assembly, pull the bolt carrier group rearward out of the receiver pool, and lay it flat on a padded work tray. 3. Use a small punch tool to pull the existing firing pin retaining cotter pin out from the right flank of the carrier shell. 4. Tip the carrier body vertical to drop the old firing pin out the back end, then rotate the bolt head inline to pull the cam pin vertically clear of its guide slot. 5. Pull your stripped bolt body forward out of the carrier cavity, clean the inner carrier walls with a wire brush, and apply a light bead of high-efficiency weapon oil to the new nitrided cam pin body. 6. Re-insert the bolt, slide the new KAK nitrided cam pin straight down through the carrier window, drop the new chrome firing pin into the center channel from the rear, and push the new retaining cotter pin completely home from left to right to lock the entire drive core securely before rolling downrange.*
Key Features
- Hardened Hard-Chrome Firing Pin: Milled from heavy-duty carbon steel and finished with premium white industrial chrome to shrug off hot gas scaling and primer pocket impact deformation.
- Friction-Reducing Nitrided Cam Pin: Features an ultra-hard liquid QPQ nitride surface shell that smooths out bolt unlocking cycles while drastically extending the life of your receiver's cam track.
- Mil-Spec Retention Cotter Pin: Outfitted with a high-tensile spring steel cotter retaining pin designed to flex cleanly without collapsing or backing out under heavy full-auto firing schedules.
- True Drop-In Factory Blueprinting: Requires absolutely zero hand-stoning, micro-filing, or custom fitting, slipping smoothly into any standard carrier body out of the packaging.
- Multi-Caliber Carrier Compatibility: Designed to drop directly into all standard format weapon systems running on 5.56 NATO, .223 Rem, .300 Blackout, and 6.5 Grendel carrier groupings.
- Essential Tactical Bench Kit: The perfect, affordable combination pack for completing stripped aftermarket carriers or building an emergency field-repair kit for your gear bag.
Product Specifications
- Brand: KAK Industry® (Albemarle, North Carolina / Made Proudly in the USA)
- Model Line: High-Performance Bolt Carrier Group Factory Assembled Replacement & Small Parts Kits
- MPN/SKU Code: MO-304-1010-003 (Carrier Completion Pack Base Specification Standard SKU)
- UPC Code Profile: 811163035804
- Bolt Carrier Group Compatibility: Standardized Mil-Spec AR-15 / M16 Carrier Body Shells Natively
- Supported Caliber Actions: 5.56x45mm NATO, .223 Rem, .300 AAC Blackout, 7.62x39mm AR, 6.5 Grendel
- Firing Pin Material Processing: High-Tensile Carbon Steel Alloy / Micro Precision-Ground Form
- Firing Pin Surface Dressing: Premium Slick High-Heat White Hard-Chrome Plated Finish Skin
- Cam Pin Material Processing: Hardened Tool Steel Alloy Core (Milled Cross-Bore Pass Geometry)
- Cam Pin Surface Dressing: Quench-Polish-Quench (QPQ) Liquid Matte Black Nitride Protective Shell
- Retaining Pin Material Base: Heat-Treated Manganese Phosphate Coated Heavy Spring Carbon Steel
- Full Kit Component Checklist: 1x Chrome Firing Pin, 1x Nitride Cam Pin, 1x Spring Cotter Retaining Pin
- Packaging Format Class: Factory Original Sealed KAK Industry Heavy-Poly inventory Protection Pack Bag
- Product Type Category: Rifle Components / Internal BCG Hardware Parts & Completion Kits
- Overall Linear Firing Pin Length: ~3.28 Inches (~83.3 mm Standard Mil-Spec Dimension Axis)
- Overall Cam Pin Structural Height: ~0.76 Inches (~19.3 mm Square-Shoulder Clearance Height)
- Net Combined Hardware Mass: ~0.65 Ounces (~18.4 Grams Ultra-Lightweight Critical Internal Mass)
- Global Quality Certifications: Formulated to Rigid US Commercial and Military Blueprint Duty Standards
- Warranty Tracking Protection: Fully Backed by KAK Industry Factory Material Performance Guarantee
