By far the best gearbox shell available. It is made of a much better metal than most stock pot metal gearbox shells with reinforcement in needed spots.
The bushings are excellent and rotate very easily with 16:1 gears and a G&P m120 motor. The tappet plate is slightly different than TM spec ones due to reinforced spots in the shell itself, meaning if the tappet breaks, you have to replace it with a lonex one. I dont see an issue, but others might.
I had a slight issue fitting SHS trigger contacts and a G&P cutoff lever in it, it required a bit of sanding down of the contacts and lever, but not a big deal. 5/5 all the way. Definitely worth the price!