This product is mainly to improve the GBB stability of the operation, reduce the damage of the nozzle and bolt carrier and other accessories in one pass, and increase the positioning ability of the bolt carrier.

- suitable for M4 GBB Rifle (Excluded: VFC 416C GBB Model)

- product include :
10mm Nylon Spacer X 4
5mm Nylon Spacer X 2
2.5mm Nylon Spacer X 2
5X50mm Screw X 1
Recoil Spring Base X 1
Recoil Spring X 1
Recoil Spring Spacer X 2
Recoil Spring Cap X 1
M5 Locknut X 1
Spring cap X 1

Manufacturer : ProWin