Rise Armament 12002 Upper Parts Kit AR-15 Black Steel Complete

The Rise Armament 12002 Upper Parts Kit delivers precision-machined components that eliminate the guesswork from AR-15 upper assembly. This complete kit provides every small part needed to finish an AR-15 upper receiver with military-specification reliability and enhanced durability.

What Makes This Different

Rise Armament manufactures these components from 4140 steel with precise tolerances that exceed mil-spec standards. Each part undergoes heat treatment and black nitride coating for corrosion resistance and extended service life. The kit includes upgraded components like a heavy-duty ejector spring and enhanced extractor that improve extraction reliability over standard parts.

Key Features

• Complete upper parts kit - includes all necessary small parts for assembly
• 4140 steel construction with black nitride finish for corrosion resistance
• Mil-spec dimensions ensure proper fit in all AR-15 upper receivers
• Enhanced extractor spring provides reliable case extraction
• Heat-treated components resist wear under high round counts
• Includes forward assist assembly, ejection port cover, and hardware
• Compatible with all standard AR-15 barrels and bolt carrier groups

Field testing demonstrates consistent performance across temperature ranges from -20°F to 140°F. The enhanced extractor spring maintains proper tension through thousands of firing cycles, reducing extraction failures common with standard springs. Competition shooters report improved reliability during rapid-fire strings, while tactical users appreciate the consistent function under adverse conditions.

Technical Specs

• Material: 4140 steel with black nitride coating
• Compatibility: All mil-spec AR-15 upper receivers
• Includes: Forward assist, ejection port cover, springs, detents, pins
• Thread pitch: Standard 1/4-28 for forward assist
• Finish: Black nitride for corrosion resistance
• Weight: 0.8 oz complete kit
• Country of Origin: USA

This kit eliminates the need to source individual components from multiple suppliers while ensuring compatibility between all parts. Rise Armament's reputation for precision manufacturing makes this the reliable choice for builders who demand consistent performance from their completed upper assembly.