Modify SMOOTH steel gear set with lower support for 7mm gearbox (16.32:1) Hi Speed

Newest tempered steel set with bearing lower support installed
hi quality nano class threatment process
super low friction and noise reduction
max rotation with incredible energy save
ideal to use with max 110 spring

included parts:
-steel gears
-bearing lower support
-7mm ball bearing
-antireversal lever

fits g&g,ka,marui type gearbox for m16/g3/ak guns etc....