KAK Industry AR 15 Lower Parts Kit No Grip or Trigger Guard 506 1015 008 UPC 811163034951
Product Description
The KAK Industry AR-15 Lower Parts Kit Minus Grip and Trigger Guard (SKU: 506-1015-008 / UPC: 811163034951) is a builder-focused internal components package engineered specifically for custom lower receiver assemblies. By omitting the standard A2 pistol grip and Mil-Spec aluminum trigger guard, this package eliminates throwaway surplus parts, allowing custom armorers to integrate aftermarket ergonomic grips and oversized winter trigger guards without paying for components they plan to discard.
Every critical component in this kit is manufactured to strict USGI dimensional tolerances, utilizing heat-treated carbon and alloy steel designed to withstand hard-use operational cycles. The hammer and trigger assemblies are precision-machined from investment cast AISI 8620 steel, ground at critical sear engagement surfaces to deliver a crisp, predictable 5.5 to 6.5 lb combat trigger pull. All major exterior control components—including the safety selector, magazine catch, bolt catch, and takedown pins—receive a heavy MIL-DTL-16232 Type M Class 2 manganese phosphate finish for maximum lubricity, corrosion resistance, and solvent tolerance.
The included spring suite is wound from premium music wire and tempered chrome silicon steel, ensuring consistent return pressure, positive bolt catch engagement, and reliable primer ignition across hundreds of thousands of cycles. Whether completing a high-grade forged 7075-T6 receiver or tuning a duty rifle, this lower parts kit provides reliable, uncompromised mechanical lockup and seamless interface with all standard 0.154" Mil-Spec lower receiver geometries.
*Armorer Bench Notes & Real-World Staging Guidance:*
Fitment Matrix: Direct drop-in fit for all standard Mil-Spec AR-15 (5.56 NATO / .223 Rem / 300 AAC Blackout / 6.5 Grendel) stripped lower receivers. CRITICAL: Not compatible with AR-10, LR-308, or SR-25 large-frame lower receivers due to dimensional differences in takedown pin lengths, magazine catch threaded shafts, and bolt catch dimensions. Uses standard small-pin 0.154" hammer and trigger holes; incompatible with vintage Colt 0.169" large-pin lowers.
- Ensure the work area is clear, the stripped lower receiver is clean and deburred, and all eye protection is securely staged before handling detents and springs.
- Install the magazine catch assembly, threading the catch shaft into the release button until flush with the outer face while testing spring tension.
- Support the bolt catch ears using an armorer block, insert the bolt catch spring and plunger, and drive the 3/32" roll pin from front to rear using a roll pin punch.
- Install the front pivot pin and spring/detent using a pivot pin installation tool to prevent detent launch; slide in the rear takedown pin, spring, and detent from the buffer ring recess.
- Install the 0.154" trigger, disconnector, disconnector spring, hammer, and J-pin springs into the lower pocket, verify sear engagement, and install the safety selector, detent, and grip screw assembly before conducting a comprehensive multi-stage dry-fire function check.
Key Features
- Builder-Centric Configuration: Omits the standard A2 grip and trigger guard to save budget and prevent waste on custom rifle builds.
- Heat-Treated 8620 Steel FCG: Precision-cast and ground hammer and trigger provide a dependable single-stage combat pull with zero sear slip.
- Mil-Spec Manganese Phosphate: Heavy military-grade surface treatment delivers superior anti-wear protection and oil-retentive corrosion resistance.
- Precision 0.154" Diameter Pins: Fits all standard USGI small-pin AR-15 lower receiver channels without binding or excessive slop.
- Complete Heavy-Duty Spring Pack: High-tensile spring steel ensures consistent cycling, reliable primer strikes, and positive control reset.
Product Specifications
- Brand: KAK Industry
- Model/Series: AR-15 Lower Parts Kit (Minus Grip & Trigger Guard)
- MPN / SKU: 506-1015-008
- UPC: 811163034951
- Platform Compatibility: Standard Mil-Spec AR-15 Stripped Lower Receivers (0.154" Pin Size)
- Country of Origin: United States of America
