JG Complete Full Metal Lipo Ready Gearbox for AK Series Airsoft AEG Rifles w/ Motor

"This gearbox is great i had bought a cyma ak and the gearbox had stopped working i switvhedbit with this and it made a huge difference also the fps is high like 360-401 the original gearbox i had was 280-300 so i am very satisfied thank you evike ❤️

"I'd been trying to put a bunch of upgrades into my AK's stock gearbox, had ALL SORTS of problems, and eventually gave up in frustration and bought this. I'm not terribly impressed with the range and accuracy, but the problem could be with my hopup setup. I haven't used this very extensively, so I can't say for sure how durable it is, but from what I've seen I would expect it to be fine. I don't have a chronograph so I can't say how many FPS it'll give; however, it's quite easy to measure the ROF, just record the sound of it firing into a program like Audacity and count the peaks in sound over a 1 second period. I tested it with 3 different batteries, and here are the results:

8.4 V (7s) NiMH: 14 RPS
7.4 V (2s) LiPo: 12.5 RPS
11.1 V (3s) LiPo: 21 RPS

One other thing: FULL-AUTO ONLY. For some reason, whether I put the selector switch in semi-auto position or full-auto position, it only shoots full-auto. At some point I'll open everything back up and make sure the selector switch is attached properly and all, but I'm fairly sure it is, but still, no semi-auto firing.