KAK Industry M16 Complete Lower Receiver Parts Kit - Full-Auto Fire Control Group, Includes M16 Auto Sear, Spring, and Pin, Mil-Spec Phosphate Finish - LRPKAKM16LPK
Product Description
Restoring an NFA-registered machine gun receiver, assembling a post-sample machine gun dealer sample, or building out a law enforcement specialty rifle requires a lower receiver components group manufactured to absolute military dimensional limits. Standard semi-automatic parts kits lack the physical geometry needed for multi-mode automatic timing, while low-grade cast pins can shear or binding triggers can ruin workflow on your bench. The **KAK Industry® M16 Complete Lower Receiver Parts Kit with Auto Sear (LRPKAKM16LPK)** completely flatlines these custom assembly bottlenecks, providing a high-strength **forged and heat-treated M16 specification fire control group** optimized for high-volume duty cycles.
Proudly manufactured to strict military tolerances in the United States by KAK Industry, this turn-key armorer kit features a durable manganese phosphate outer coating that effectively resists moisture and operational wear. At its core, the package supplies an **authentic M16 open-back hammer, dual-hook disconnector, and select-fire trigger module**. The defining functional feature is the inclusion of a factory-calibrated **M16 automatic sear assembly complete with its high-memory spring and retaining pin**. This delivers the precise physical timing geometry required for select-fire operations when properly seated within a true M16 pocket profile lower. Ready for heavy field environments, this precision part group brings absolute mechanical reliability straight to your armorer workbench.
Engineered to drop seamlessly into properly machined M16 spec receiver channels, this factory-calibrated build kit ensures absolute structural fire control alignment directly from your workspace bench.
*Armorer Bench Notes & Real-World NFA / Legal Compliance Staging Guidance: The KAK Industry LRPKAKM16LPK build kit arrives workspace ready, containing the complete select-fire M16 hammer, trigger, selector switch (Safe/Semi/Auto), disconnector, automatic sear block with spring and pin, an A2-style polymer pistol grip, a standard trigger guard, and a full assortment of detents, springs, and receiver assembly pins. CRITICAL LEGAL COMPLIANCE & HOUSING INTERFACE MATRIX: This precise fire control collection is engineered natively, strictly, and dimensionally to drop into **machine gun lower receiver shells featuring a machined M16 automatic sear pocket and a 0.125-inch auto sear pin hole**. *NFA / Legal Status Alert:* The possession and installation of these individual internal components are governed under strict federal frameworks. Possession of full-auto parts kits alongside an un-milled semi-automatic AR-15 receiver on your bench can be interpreted as constructive possession of an unregistered NFA machine gun under ATF guidelines. **Ensure you are strictly operating in compliance with all Federal, State, and Local firearms laws during storage and assembly.** Armorer Workbench Custom Staging Sequence: 1. Visually and physically confirm your host receiver platform is completely clear of live ammunition, the upper section is separated, and the lower deck is empty and safe. 2. Secure your lower receiver into a dedicated polymer mag-well vise block to protect the metal skin from scuff marks. 3. Install the mag catch assembly, bolt catch roll pin, and front takedown detent stack into their respective receiver channels. 4. Insert the M16 trigger and disconnector layout into the bottom floor basin, sliding the standard trigger axis pin smoothly through the receiver walls. 5. Cock the M16 hammer downward, capture the hammer spring legs over the trigger sleeve pin, and tap the hammer pin home. 6. Slip the M16 auto sear with its spring into the specialized upper rear pocket channel, then use a punch to capture the assembly with the auto sear pin before testing manual action cycling loops on your bench.*
Key Features
- True M16 Select-Fire Geometry: Includes the essential open-back hammer, multi-tier select-fire trigger, and dual-hook disconnector for authentic multi-mode capability.
- Includes Auto Sear & Pin: Comes completely standard with the hard-to-find M16 auto sear module, auto sear spring, and precise 0.125-inch retaining pin.
- Mil-Spec Manganese Phosphate Finish: Treated with a professional manganese phosphate coating to lock out moisture tracking, minimize friction, and guard against corrosion.
- Hardened Steel Pins & Detents: All load-bearing axis pins, pivot bars, and mechanical safety detents are machined from hardened steel to prevent shearing under rapid action lines.
- 3-Position Selector Drum: Features an authentic full-auto style safety selector switch that operates seamlessly across standard Safe, Semi, and Automatic orientations.
- Complete Turn-Key Builder Kit: Ships with every tiny spring, detent pin, trigger guard, and A2 pistol grip needed to populate a stripped lower frame on the bench.
Product Specifications
- Brand: KAK Industry® (Albany, Missouri / Sourced US Materials)
- Model Line: High-Performance M16 Series Factory Original Select-Fire Components
- MPN/SKU Code: LRPKAKM16LPK (M16 Full-Auto LPK Specification Base SKU)
- Firearm Receiver Compatibility: True Mil-Spec M16 Machine Gun Receiver Housings Natively
- Fire Control Group Class: 3-Position Select-Fire Action Layout (Safe - Semi - Auto Functionality)
- Auto Sear Pin Dimension: 0.125-Inch Standard Military Spec Automatic Sear Retention Diameter
- Structural Material Base: Forged, Heat-Treated High-Tensile Carbon Steel Internal Components
- Exterior Surface Treatment: Mil-Spec Mil-DTL-16232 Manganese Phosphate Anodized Anti-Wear Armor
- Pistol Grip Element Style: Traditional Injection-Molded Black Synthetic A2 Polymer Hand Grip Checkering
- Trigger Guard Material: Standard Stamped Aluminum Bar Layer with Hard Roll Pin Locks
- Full Kit Component Checklist: Trigger, Hammer, Disconnector, Selector, Auto Sear Assembly, Springs, Pins, Grip
- Packaging Format Class: Factory Original Sealed KAK Industry Heavy-Wall Multi-Compartment Parts Pack
- Product Type Category: Rifle Components / Full-Auto Lower Parts Kits & NFA Staging Essentials
- Trigger Pull Weight Dynamic: Standard Military Duty Weight Trigger Break Curve Profiles
- Net Combined Component Mass: ~9.20 Ounces (~260.8 Grams Complete Structural Kit Base Weight)
- Global Quality Testing: Built Strictly to US Mil-Spec Dimensional Print and Temper Tolerances
- Warranty Tracking Protection: Fully Backed by KAK Industry Factory Materials Performance Guarantee
