M4 AR-15 Lower Receiver Spring Kit 20 Piece Gunsmith Box

Package include:
- 20 x Bolt Catch Spring
- 20 x Buffer Retainer Spring
- 20 x Trigger Spring
- 20 x Hammer Spring
- 20 x Disconnector Spring
- 20 x Magazine Catch Spring
- 20 x Selector Spring
- 40 x Detent Spring

 
Features:
- Replace worn springs
- Commonly used springs
- Essential for a gunsmith or AR owner