Action Army Infinity Custom Airsoft AEG Motor
(Model: R40000 / Long Type)

"This thing is insane! I purchased the 45,000K rpm version about 2 years ago, (back when it was $45 lol) and it has been insanely reliable. I have put tens of thousands of rounds through it, along with countless stints of sustained full auto, and I've never once had a single issue with it. I've never even had issues with overheating, which is something I can't even say about most stock motors.

I do have to post a warning, most low to midrange guns can't survive this motor. I've snapped a full metal gearbox clean in half after about 20-30K rounds with this motor, (albeit it was an ares) and my friend killed his gun with a similar spec motor as well.

If you know what you're doing, I couldn't recommend this motor more. If you don't know what you're doing, go with the 35,000K rpm version.

"Great product works very well for my valken asl m4. Had to bore out the hole in the handgrip for it to fit but other than that works like a charm!!!

"Warning the 40k and 45k are only for people who know what they are doing! This spilt the gearbox in my EMG Jack M4 clean in half as well as taking out the piston, cylinder, gears, tappet plate, and cylinder head. But if you are an experienced gun builder and want some insane performance buy this motor! I love it so much I am building a custom gearbox so I can keep running this motor. It is amazing I ran it for six months which consisted of many games with almost continuous sustained firing. And even when it took out almost my entire gearbox, it came out with not even one frayed wire or even a single sign of wear on the pinion gear.

Pros:
Super fast even though it is a high torque motor
Super reliable
One of the highest performing motors on the market

Cons:
makes the motor grip hot at times
Will destroy anything short of a dedicated build (I had someone have me put it in a brand new king arms TWS striker... It lasted a grand total of four midcaps before totaling the gun.)

Overall it is a great motor. Just be careful before putting the 45k in your gun.