All that you need to keep your BT-4 paintball gun in tip top shape is included in the BT-4 player parts kit. If it's not here, you don't need it. These are factory parts and are the exact replacements for the best fit.

This kit includes:

- 1 drive spring
- 1 drive spring pin
- 2 ball detents
- 1 shock absorber o-ring
- 1 valve / rear bolt o-ring
- 1 lower grip screw
- 1 lower grip nut2 valve bolts
- 1 long receiver bolt
- 2 short receiver bolts
- 2 receiver bolt nuts
- 1 grip panel screw
- 1 sear spring