Luth-AR M16 Full Auto Lower Receiver Parts Kit w/ Auto Sear and Pin - LRPK-16 - UPC 859992007807
Product Description
The Luth-AR M16 Full Auto Lower Receiver Parts Kit (LRPK-16) is a comprehensive, Mil-Spec small-parts package designed specifically for servicing, building, or completely overhauling registered M16 receivers, NFA transferable machine guns, and licensed post-sample machine gun builds. Manufactured from high-strength, heat-treated steel alloy components, this kit includes every individual spring, detent, pin, and fire control group component needed to assemble an M16 lower receiver.
Unlike standard semi-automatic AR-15 parts kits, the LRPK-16 features an authentic full-auto M16 fire control group—including an auto selector switch, auto hammer with J-spring, auto trigger, auto disconnector, and a complete M16 auto sear assembly with spring and pin. All small parts are precision CNC-machined to strict USGI military dimensions and finished in a corrosion-resistant black manganese phosphate coating for maximum wear resistance and long-term mechanical reliability under severe fully automatic cyclic rates.
Packaged with an A2-style black composite pistol grip, pistol grip bolt, and lock washer, the Luth-AR LRPK-16 provides gunsmiths, SOT Class 3 manufacturers, and law enforcement armorers with a complete, single-source replacement kit engineered to exacting government production standards.
*Armorer Bench Notes & Real-World Staging Guidance:
Fitment & Compliance Matrix: Direct fit for legal, registered M16 receivers, NFA transferable machine guns, and post-sample Class 3 SOT builds. Note: All NFA Rules Apply. Full-auto fire control group components (auto hammer, auto disconnector, auto selector, and auto sear) are NOT compatible with standard semi-automatic AR-15 lower receivers without proper NFA receiver machining.
- Verify the host receiver and workspace are completely clear, safe, and unloaded prior to assembly.
- Install the bolt catch, magazine catch, pivot/takedown pins, buffer retainer, and safety selector into the stripped lower receiver using standard armorer punch tools.
- Install the M16 auto trigger, auto disconnector, auto hammer, and auto sear assembly into the receiver, applying a drop of synthetic gun oil to high-friction pin contact surfaces before function testing full-auto, semi-auto, and safe positions.
Key Features
- Complete M16 Select-Fire Components: Includes authentic full-auto fire control components (auto trigger, auto hammer, auto disconnector, and auto selector).
- Includes Complete M16 Auto Sear Assembly: Features factory USGI-pattern auto sear, auto sear spring, and auto sear pin.
- Mil-Spec Heat-Treated Construction: Forged and CNC-machined steel parts engineered to withstand high cyclic stress and heat.
- Black Manganese Phosphate Finish: Severe-duty surface treatment protects steel components against friction, carbon fouling, and corrosion.
- All-In-One Assembly Package: Contains every detent, spring, roll pin, bolt catch, magazine catch, and A2 pistol grip needed for lower receiver assembly.
Product Specifications
- Brand: Luth-AR
- Model: M16 Lower Receiver Parts Kit w/ Auto Sear and Pin
- MPN: LRPK-16
- UPC: 859992007807
- Platform Compatibility: M16 / NFA Full-Auto Lower Receivers
- Fire Control Group: M16 Full Auto (Safe / Semi / Auto)
- Material: Heat-Treated Steel Alloy & High-Impact Polymer
- Finish: Black Manganese Phosphate / Matte Black
- Grip Style: Standard A2 Composite Pistol Grip
- Mass: ~9.2 oz (260.8 g)
