DoubleStar M16 Complete Lower Parts Kit - Mil-Spec Select-Fire Components, Heat-Treated Steel Construction, A2 Grip Included, Black Matte - AR320 / LRPDSM16LPK
Product Description
Rebuilding a registered machine gun lower receiver, setting up a sample select-fire post-sample platform, or completing a highly accurate retro visual clone rifle requires small pins, detents, and internal linkage groups manufactured to exact military specifications. Universal semi-automatic civilian parts packs omit the critical fire-control surfaces, disconnectors, and selectors required for deep tactical staging configurations on your bench. The **DoubleStar® M16 Complete Lower Parts Kit (AR320 / LRPDSM16LPK)** completely flatlines these design discrepancies, delivering a full suite of premium, heat-treated military-specification internal parts.
Proudly machined and heat-treated to professional duty standards in the United States by DoubleStar, this authentic M16 components block features **heavy-duty carbon steel construction** finished in a protective matte black manganese phosphate (Parkerized) shell. Unlike commercial semi-auto builder sets, this authentic kit features an un-cropped **M16-pattern hammer, an open-backed M16 disconnector, a tail-cleared select-fire trigger**, and a full **three-position selector switch (Safe/Semi/Auto)**. Complete with a standard injection-molded black polymer A2 pistol grip, an aluminum trigger guard assembly, and every single low-tolerance detent and high-memory spring coil needed to completely flesh out your receiver floor pins, this setup brings your armorer station back to peak tactical readiness.
Engineered as a drop-in internal staging matrix for authentic military dimensions, this turnkey parts assortment delivers historical accuracy and uncompromising parts compliance straight to your workbench.
*Armorer Bench Notes & Safety Compliance Staging Guidance: The DoubleStar AR320 parts kit arrives workspace ready, containing individual small-parts sub-compartments packed inside factory original heavy-mil clear poly inventory control presentation skin sleeves. NATIVE MIL-SPEC SELECT-FIRE COMPLIANCE MATRIX: This kit features authentic M16 fire-control components configured natively, strictly, and explicitly for **registered full-automatic lower receivers or appropriately certified post-sample tactical weapon chassis configurations**. *Legal & Regulatory Compliance Protocol:* While possession of uninstalled M16 components is legal across many jurisdictions, installing this package into a standard semi-automatic receiver without proper regulatory tracking credentials, NFA compliance stamps, or active class licenses violates severe federal and regional laws. *Workbench Platform Versatility:* The auxiliary non-fire control parts (including the takedown pins, bolt catch assembly, magazine button, springs, and detents) cross-index perfectly into **all standard AR-15 lower receiver blocks** on your bench. Armorer Workbench Custom Staging Sequence: 1. Visually and physically confirm your host lower receiver is completely clear of an upper receiver assembly, no live ammunition is present in the workspace, and your armorer block is secured in a vice. 2. Layer a light drop of liquid gun lubricant onto the pivot surface channels of the springs, detents, and trigger pins prior to installation. 3. Deploy a specialized slave pin tracking rod when positioning the trigger and open-backed disconnector springs over the lower deck floor slots. 4. Tap the roll pins gently into place using a non-marring nylon or brass starter punch tool to prevent scratching the anodized surface layer of the lower receiver framework. 5. Perform a comprehensive manual function and safety check to verify distinct engagement boundaries across all three selector settings before running performance diagnostics downrange.*
Key Features
- Authentic M16 Select-Fire Internals: Includes the full military-profile hammer, tail-cleared trigger, open-backed disconnector, and three-position selector required for genuine select-fire builds.
- Mil-Spec Manganese Phosphate Finish: All steel surfaces feature a deep, porous Parkerized finish that absorbs oil, blocks corrosion, and reduces frictional wear.
- Heat-Treated Structural Steel: Core components are forged from high-tensile carbon steel and heat-treated to prevent pocket wall peening or pin notch tracking failures over time.
- Complete A2 Pistol Grip Assembly: Ships with a standard checkered black polymer A2 pistol grip, complete with its heavy-duty mounting bolt and star washer.
- High-Memory Spring Wire Array: Every spring wire is coiled from premium high-tensile spring steel to ensure constant, snappy returns on all detents, catches, and levers.
- Turn-Key All-In-One Pack: Eliminates the hassle of sourcing individual small parts by grouping every pin, plunger, and spring needed to completely build out a lower shell.
Product Specifications
- Brand: DoubleStar® / J&T Distributing (Winchester, Kentucky)
- Model Line: High-Performance Mil-Spec Internal Weapon Component & Armorer Service Spares
- MPN/SKU Code: AR320 (Alternative Manufacturing Inventory Code Index: LRPDSM16LPK)
- Ammunition & Framework System Match: AR-15 / M16 Platform Standard Lower Receivers Natively
- Fire Control Profile Class: Full-Specification M16 Select-Fire (Safe / Semi-Auto / Full-Auto 3-Position Geometry)
- Core Metal Base Materials: Premium Heat-Treated Forged Carbon Steel Alloys & Machined Structural Pins
- Exterior Surface Coat Protection: Mil-Spec Matte Black Manganese Phosphate (Parkerized) Anti-Friction Barrier
- Pistol Grip Housing Configuration: Standard Checkered High-Impact Black Polymer A2 Military Specification Handle
- Trigger Guard Component: Standard Lightweight Machined Aluminum Bow Strip with Retention Roll Pin
- Full Kit Component Checklist: Hammer, Trigger, Disconnector, Springs, Selector, Bolt Catch, Takedown Pins, Detents, Grip
- Packaging Format Class: Factory Sealed Heavy-Duty Poly Inventory presentation Bag with Cardboard Barcode Headers
- Product Type Category: Receiver Components / Fire-Control Parts & Lower Receiver Build Kits
- Pin Diameter Calibration: Standard Mil-Spec Small Pin Configuration Dimensions (0.154" Trigger/Hammer Pins)
- Net Combined Components Mass: ~7.20 Ounces (~204.1 Grams Total Weight of All Pins, Grips, Springs, and Springs)
- Country of Quality Manufacture: Machined, Heat-Treated, Packed, and Performance Field-Tested Proudly in the USA
- Warranty Tracking Protection: Fully Backed by DoubleStar Comprehensive Product Materials Defect Guarantee
