The “308” Heavy “18lb” Red color coded AR-15/AR-9 buffer recoil spring.   Use this spring to tune the action of your PCC or AR15. Designed for use with standard buffers, extended buffers, and can be used with the Scheel Roller-Delayed Buffer System*.

Package of 2.

*Short stroke bumper spacer .750″+ recommended for use with Scheel’s Roller-Delayed Buffer System to prevent coil bind and extend spring life.