CYMA Standard Complete 8mm Version 2 Gearbox for M4 Series Airsoft AEG (Type: Rear Wired / With Motor)

"Great Gearbox!

Put this in my 15yr old KWA SR10 and it works great.

The fit is a bit tight, but it all functions well.

With an 11.1v lipo I am getting around ~30rps.

"THIS REVIVED MY CYMA M16A4 BACK TO LIFE AFTER 4 MONTHS WOOOOOOOO

"Got this gear box In today! Pretty solid gearbox. I picked it up for my short m4 so I can use it more on the fields. Seems to hit hard, I would say the fps is around the same as my Kwa sr10 (about 400). That's just judging from the speed of the bbs won't know the true fps till I take it out on the field. Great gear box, the only issue I ran into was it didn't fit in the metal body at first had to do some moding to the body and gear box to get it in. I'll make sure to put my fps reading in on the comment section soon.