Metal Patter 7mm Bearing Cylinder Gearbox Kit For Nwell M4 Replacement Accessories

Features:

The usege of this product is to modify the gel ball blasting toy and replace the accessories of the toy in time to extend the service life of the toy. 
Meanwhile, the product has good performance. You can make your equipment more powerful by DIY.

6 x 7MM Upgraded Bearings

1 x Cylinder

1 x Ladder Gearbox+Bearing Patter Head

1 x Steel cut gear set

1 x Spring