Aero Precision AR15 Upper Parts Kit Forward Assist and Dust Cover Black APRH100270C UPC 815421020571
Product Description
The Aero Precision® AR-15 Upper Parts Kit (SKU: APRH100270C / UPC: 815421020571) supplies every critical hardware component required to completely dress and finalize a stripped Mil-Spec AR-15, M4, or M16 upper receiver. Built to strict USGI dimensional tolerances, this kit eliminates assembly guesswork by packaging a complete forward assist group alongside a duty-grade ejection port cover door assembly, ensuring positive cartridge seating and reliable chamber sealing against grit, carbon, and foreign debris.
Engineered for high-cycle operational environments, the ejection port door is stamped from heavy-gauge carbon steel and mated with a precision-ground hinge pin, torsion spring, and retaining C-clip. The forward assist features a case-hardened steel pawl and plunger designed to withstand repeated mechanical impacts against bolt carrier group drive serrations. All steel components are treated with a MIL-DTL-16232 Type M Class 1 manganese phosphate finish, creating a non-reflective matte black micro-crystalline structure that retains lubricating oils and resists aggressive corrosive fouling, solvent degradation, and environmental exposure.
Whether assembling an all-weather duty rifle, finalizing a lightweight competition build, or servicing an armory inventory of hard-run carbines, the Aero Precision Upper Parts Kit drops directly into standard receiver forgings. The heat-treated music wire torsion spring provides instantaneous port door deployment upon the first rearward stroke of the bolt carrier, while the forward assist spring provides immediate reset and tactile feedback during manual chambering drills.
*Armorer Bench Notes & Real-World Staging Guidance:*
Fitment Matrix: Direct fit for all Mil-Spec AR-15, M4, and M16 forged (7075-T6) and billet upper receivers. WARNING: Incompatible with large-frame DPMS Gen 1/Gen 2 LR-308 and Armalite AR-10 receivers, which require dedicated large-bore ejection port doors and hinge rods. Incompatible with slick-side uppers lacking forward assist housings or ejection port hinge lugs. Always tape the receiver surface adjacent to the forward assist roll pin hole to prevent accidental cosmetic gouging during pin driving.
- Ensure the host firearm or upper receiver is completely unloaded, cleared, and visually/physically verified empty before clamping into a dedicated receiver vise block.
- Lubricate the forward assist plunger, spring, and housing channel; orient the pawl flat toward the interior bolt carrier bore and insert the assembly into the receiver.
- Depress the forward assist plunger past the roll pin channel using a slave punch, then drive the included 3/32" spiral roll pin flush through the receiver housing from top to bottom.
- Position the ejection port cover spring with the short leg resting against the exterior door face, load one-half turn of pre-tension, slide the hinge pin through the forward receiver lug and spring coil, and secure the assembly using the retaining C-clip in the machined groove.
- Perform a bench function test: close the ejection port door and verify solid detent engagement; cycle a charging handle and bolt carrier to verify crisp, uninhibited pop-open clearance; depress the forward assist to verify free travel and immediate spring reset.
Key Features
- Complete Upper Receiver Hardware: Delivers all internal and external hardware required to outfit a stripped AR-15 upper receiver in a single cohesive package.
- Mil-Spec Metallurgy & Construction: High-tensile stamped steel door and case-hardened forward assist pawl ensure long-term structural integrity under severe firing schedules.
- MIL-DTL-16232 Manganese Phosphate Finish: Non-reflective matte black Parkerizing provides deep chemical bonding with lubricants for superior corrosion resistance and wear life.
- High-Rate Torsion Spring: Ensures immediate, reliable ejection port opening the instant the bolt carrier group moves to the rear.
- Universal Platform Fitment: Precision-manufactured to USGI specifications to guarantee drop-in compatibility across all standard AR-15 forged and billet receivers.
Product Specifications
- Brand: Aero Precision®
- Model/Series: AR-15 Upper Parts Kit
- MPN / SKU: APRH100270C / APRH100270
- UPC: 815421020571
- Platform Compatibility: AR-15 / M4 / M16 Mil-Spec Upper Receivers
- Door Material: Stamped Carbon Spring Steel
- Forward Assist Material: Case-Hardened Carbon Steel
- Finish: Mil-Spec Manganese Phosphate (Matte Black)
- Included Hardware: Forward Assist Plunger & Pawl, Forward Assist Spring, Roll Pin, Ejection Port Cover Door, Hinge Pin/Rod, Torsion Spring, Retaining C-Clip
- Country of Origin: United States of America
