Ruger AR-15 Lower Parts Kit with Complete GI Trigger Group and A2 Pistol Grip - 91002
Product Description
Building a custom AR-15 from a stripped lower receiver or restoring an older duty rifle requires an uncompromising foundation of internal components. Standard commercial lower parts kits often skimp on underlying metallurgy, utilizing porous cast components or variable-rate springs that cause a gritty trigger break and inconsistent safety engagement. The Ruger AR Lower Parts Kit with GI Trigger and A2 Pistol Grip bypasses these third-party reliability gambles, serving as a comprehensive, factory-engineered completion package built to true military-tier standards. This kit delivers the mechanical safety, consistent cycling, and long-term structural durability demanded by tactical marksmen and professional armorers alike.
At the heart of this kit is a complete, single-stage Mil-Spec "GI" trigger group. Precision-machined from high-strength carbon steel forgings and selectively heat-treated to resist surface wear, the sear surfaces interact smoothly to provide a predictable, crisp wall followed by a clean break and a positive mechanical reset that you can easily track through your trigger finger. Accompanying the fire control group is a full layout of essential lower receiver structural hardware, including a standard tactical safety selector, a rugged bolt catch, and an intuitive magazine release assembly. Each steel component is treated with a heavy manganese phosphate or black oxide conversion layer to maximize lubricant retention and seal out corrosive field moisture.
To complete the ergonomic interface of your lower receiver, the package includes a classic A2-pattern pistol grip along with its matching structural mounting hardware. Molded from a high-density, impact-resistant polymer formula, the grip features aggressive checkerboarding on the side panels and a defined finger groove along the front strap, providing a secure master grip under cold, wet, or high-stress operational conditions. From the high-tensile spring wire sets that ensure snappy component retention to the hardened steel roll pins designed to withstand continuous vibrational shock, this OEM component matrix guarantees that your platform functions flawlessly across high-volume range training sessions and remote backcountry deployments.
*Armorer Bench Notes & Technical Maintenance Guidance: During lower receiver assembly, always place a protective layer of heavy tape over the receiver wall beneath the bolt catch ears before driving the bolt catch roll pin; this prevents common slip marks and finishes gouges. When installing the trigger and hammer group, apply a tiny dab of high-quality molybdenum disulfide (moly) grease directly to the primary sear engagement surfaces, hammer hooks, and interior pin bores to smooth out the initial break and prevent premature wear. Ensure your safety detent spring and takedown detent springs are completely straight during installation to prevent them from kinking inside their receiver channels. When anchoring the A2 pistol grip, torque the grip screw firmly to 30–35 in-lbs, taking care not to cross-thread the lower receiver housing.
Key Features
- Factory OEM Integrity: Manufactured by Ruger to identical engineering tolerances as their production-line tactical rifles, ensuring absolute cross-compatibility with standard AR-15 mil-spec lower frames.
- Complete Fire Control Group: Furnished with a comprehensive single-stage "GI" trigger, hammer, and disconnector setup to establish a traditional, highly dependable duty-weight pull.
- Mil-Spec Surface Armoring: Steel parts receive dense black oxide and phosphate conversions to optimize surface hardness, shield against environmental corrosion, and minimize friction.
- Classic A2 Ergonomics: Includes a field-proven checkered polymer A2 pistol grip designed to offer a slip-resistant purchase and a repeatable index angle in any weather.
- High-Tensile Wire Springs: Outfitted with premium spring steel coils configured for uniform tension and long-term elasticity, preventing light primer strikes or sluggish resets.
Product Specifications
- Brand: Ruger (Sturm, Ruger & Co.)
- Model Line: Factory OEM Replacement Components
- MPN/SKU: 91002
- UPC: 736676910021
- Firearm Platform: AR-15 / M16 Standard Pattern Lower Receivers
- Trigger Type: Single-Stage Mil-Spec GI Trigger Group
- Grip Style: Standard A2 Pistol Grip (Matte Black Polymer)
- Material Configuration: Heat-Treated Hardened Steel / High-Impact Polymer / Premium Spring Steel Wire
- Finish Cover: Manganese Phosphate / Black Oxide Anti-Corrosion Treatments
- Country of Origin: United States
