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Luth-AR Lower Parts Builder Kit (No Grip / No Trigger) - LRPK-BLDR - UPC 859992007654
Product Description
The Luth-AR Lower Parts Builder Kit (LRPK-BLDR) is a high-quality, builder-centric hardware package engineered specifically for custom AR-15 rifle staging. Designed for operators and builders who plan to install a custom aftermarket trigger and specialized pistol grip, this kit eliminates redundant stock components while providing every essential Mil-Spec internal small part, spring, and detent required to complete a stripped AR-15 lower receiver.
Precision-machined from high-strength, heat-treated steel, each small part in the LRPK-BLDR is held to strict military-specification tolerances and finished in a severe-duty black oxide coating for maximum resistance against wear, friction, and environmental corrosion. The package includes a standard safety selector assembly, bolt catch assembly, magazine catch assembly, takedown and pivot pins, buffer retainer, and a standard trigger guard with roll pin.
Ideal for custom rifle builds incorporating match-grade drop-in trigger cassettes and ergonomic grips, the Luth-AR LRPK-BLDR ensures smooth mechanical cycling, precise detent tension, and uncompromising reliability for personal defense, competition, and tactical AR platforms.
*Armorer Bench Notes & Real-World Staging Guidance:
Fitment Matrix: Direct fit for standard Mil-Spec forged or billet AR-15 (5.56 NATO, .223 Rem, 300 AAC Blackout, 6.5 Grendel) lower receivers. Note: Does NOT include a pistol grip, grip screw, or Fire Control Group (trigger, hammer, disconnector, or FCG pins). Designed specifically for use with custom aftermarket FCGs or drop-in trigger cassettes.
- Verify stripped lower receiver pin holes are clean and free of burrs or protective finish buildup before installation.
- Install magazine catch assembly, bolt catch, pivot/takedown pins, buffer retainer, and trigger guard using supplied springs and pins.
- Install your choice of aftermarket 0.154" fire control group and custom pistol grip before performing safety function checks.
Key Features
- No Grip / No Trigger (No FCG): Builder-ready configuration prevents duplicated parts when pairing with specialized grips and trigger groups.
- Mil-Spec Standard Precision: High-strength, heat-treated steel small parts machined to exact dimensional tolerances.
- Complete Small Parts Package: Includes safety selector, bolt catch, magazine release, takedown/pivot pins, buffer retainer, and trigger guard.
- Severe-Duty Black Oxide Finish: Protects internal steel components, detents, and springs against corrosion, wear, and moisture.
- Flawless Drop-In Fitment: Engineered for smooth detent engagement, precise spring tension, and reliable receiver cycling.
Product Specifications
- Brand: Luth-AR
- Model: Lower Parts Builder Kit (Without Grip / Trigger)
- MPN / Part Number: LRPK-BLDR
- UPC: 859992007654
- Platform Compatibility: AR-15 Standard Stripped Lower Receivers
- Fire Control Group: NOT Included (Build-Ready for Aftermarket / Drop-In Triggers)
- Pistol Grip: NOT Included
- Trigger Guard: Included (Standard Aluminum w/ Roll Pin)
- Finish / Color: Matte Black / Black Oxide
- Mass: ~4.4 oz (124.7 g)
