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Rise Armament Premium Lower Parts Kit Black Aluminum - SKU: 12003ADV - UPC: 850062094147
Product Description
The Rise Armament 12003ADV Premium Lower Parts Kit is an upgraded, comprehensive small parts package engineered to complete or refresh a standard Mil-Spec AR-15 lower receiver build. Designed specifically for builders using aftermarket drop-in trigger cassettes, this kit intentionally omits the standard fire control group (trigger, hammer, and fire control springs), allowing operators to select their preferred single-stage or two-stage trigger without paying for redundant factory components.
Every component in the kit is manufactured to strict dimensional tolerances to ensure crisp mechanical interaction and drop-in fitment across standard aluminum and billet AR-15 lower receivers. Key functional upgrades include an enhanced ambidextrous safety selector, an oversized aluminum trigger guard, an enlarged magazine release button, extended takedown and pivot pins, and an upgraded bolt catch. Critical wear points are finished in black nitride and anodized coatings for maximum wear resistance, corrosion protection, and smooth surface cycling.
This turnkey kit includes all necessary internal detents, springs, roll pins, and buffer retainer hardware required for a complete lower receiver assembly, streamlining the staging process for tactical, competition, or defensive platform builds.
*Armorer Bench Notes & Real-World Staging Guidance:
Fitment Matrix: Standard Mil-Spec and billet AR-15 lower receivers (designed for use with cassette-style or separate drop-in triggers).
- Verify the lower receiver is clear of all debris and secure it inside a dedicated vise block before assembly.
- Install the pivot pin detent and spring into the forward receiver boss using a pivot pin installation tool to prevent spring ejection.
- Fit the bolt catch, plunger, spring, and roll pin, ensuring the receiver finish is protected with tape during pin seating.
- Assemble the extended magazine catch assembly, ensuring the enlarged button threads flush with the catch shaft.
- Install your preferred drop-in trigger cassette followed by the Rise Armament ambidextrous safety selector, ensuring detent tracks align properly before installing the pistol grip assembly.
Key Features
- Triggerless Configuration: Intentionally excludes standard fire control group parts to optimize budget for high-performance drop-in triggers.
- Enhanced Ambidextrous Safety: Includes an upgraded ambidextrous safety selector lever for fast, smooth thumb actuation from either side.
- Upgraded Ergonomic Controls: Features an extended magazine release button, enlarged aluminum trigger guard, and tactical bolt catch.
- Durable Surface Treatments: Black Nitride and anodized hardcoat finishes protect high-wear pins and detents from carbon fouling and corrosion.
- Complete Small Parts Package: Contains all springs, detents, roll pins, and hardware required for lower receiver completion.
Product Specifications
- Brand: Rise Armament
- MPN: 12003ADV
- UPC: 850062094147
- Platform: AR-15 (Mil-Spec & Billet Receivers)
- Material: Aircraft Grade Aluminum / Heat-Treated Steel
- Finish: Black Hardcoat Anodized / Black Nitride
- Trigger Included: No (Designed for Cassette/Drop-In Triggers)
- Pistol Grip Included: No
