These gears are simply amazing. I installed them in my TM Mp5SD, it has a reinforced piston and a 120 spring, as well as a high torque motor. They were so dang easy to install, and I plan on ordering them again for my M4.
I highly recommend them!
Also, the Anti-Reversal latch has a notch in the top of it, making it very easy to release the piston if it gets stuck. These are the best gears I've ever used.
After 15000 rounds, they are still going strong.
Easy to install
Great Anti-Reversal latch
Not enough gear grease. But most people have a tub of it lying around!
Rating: [5 of 5 Stars!]