Strike Industries - M4 AR-15 Lower Receiver Spring Pro Kit - SI-AR-LRSK-PRO

A set of eight significant, most commonly replaced lower receiver springs for AR-15 carbines.

They will be perfect for home and professional gunsmith shops.

Package includes:
- 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