AR15 Lost Parts Kit

AR-15 Lost Parts Kit

Never let a lost detent or spring stall your AR-15 build again. The AR-15 Lost Parts Kit is a must-have collection of the most commonly misplaced lower receiver components. Crafted to mil-spec standards and proudly 100% made in the USA, this comprehensive set is perfect for builders, gunsmiths, and AR enthusiasts who demand reliability, precision, and convenience.

Comprehensive & Convenient

Whether you're building a new rifle or repairing a lower, this kit ensures you always have the essential small parts within reach.

Kit Includes & Features

 Buffer Retainer Pin – Nitride Finish
• Retains the buffer securely in the buffer tube
• Nitride coating for enhanced wear and corrosion resistance

 (4) Takedown / Pivot Pin Detents – Cadmium Plated
• Smooth pivot and takedown pin action
• Cadmium plating for excellent corrosion protection

 (2) Selector Detents – Cadmium Plated
• Ensures crisp selector engagement
• Built to last with a corrosion-resistant finish

 (2) Ejector / Selector Springs
• Maintains spring tension for reliable ejection and selector performance

 (2) Disconnect Springs
• Maintains correct disconnector function
• Precision wound for durability and reliability

 (6) Takedown / Pivot Pin Springs
• Generous quantity for multiple builds or future replacements
• Heavy-duty spring tension for long-lasting performance

(1) Buffer Retainer Spring
• Works in tandem with the buffer retainer for secure buffer retention

(1) Bolt Catch Detent – Nitride Finish
• Assures reliable bolt catch function
• Finished for durability in demanding environments

 (2) Bolt Catch Springs
• Provides positive and consistent bolt catch engagement

 (2) Extractor Springs
• Essential for reliable extraction under rapid fire
• Built for resilience and consistent cycling

 (2) Extractor Inserts
• Maintains extractor function and adds extra support

 (2) Extractor O-Rings
• Enhances extractor tension and reliability

 (2) Firing Pin Retaining Pins
• Secures your firing pin in place
• Vital for safe and dependable function

 100% Made in the USA
• Every component is precision manufactured in the United States
• Supports American manufacturing and strict quality standards