Modify Tech Torus 8mm Reinforced V.2 Gearbox Shell w/ Tappet Plate

"I really hope that Evike gets these back in stock/Modify didn't discontinue them. This is my fourth gearbox for my custom build and it is by far the best.

Pros:
I would probably pay $100 for these, but I got it for only $60. They're that great.
Uses torque screws, which are pretty hard to strip. It also comes with the corresponding torque screwdriver.
It has a bunch of holes on its externals, which helps you add grease, check shimming, check the AoE, and lets you push things while closing the gearbox (i.e. position the gear shafts into the bearings/bushings). This makes maintenance much easier.
It's very reinforced and very sturdy. My gun is about 35 BPS and 380 FPS and it holds up fine.
It looks very, very cool. But that doesn't matter, unless you have clear receivers.
There is LOTS of room to add shims, so if you take the time, you can perfectly shim it.
It's fluted, which helps to keep it from overheating, though that's almost never a problem anyway.

Cons:
It wasn't free.
Because there's so much room for shims, I had to use like 12 shims per gear, but it's worth it to have a super smooth-sounding gun.
It angles weirdly in my G&P Magpul-licensed receivers and doesn't work properly, but it works fine in the other receivers I've tried it in.

Overall, I would definitely recommend this.

"Awesome gearbox for the money. I have owned several of these because i just love them so much. They are much stronger than stock gearbox's but they arent as bulky as some *cough-KWA-cough* gearbox's because of the reinforcement. What i love most about this is the inspection ports, so much easier to lube gears, and to check AOE when building the gearbox. The torque screws are unbelievable.

Pros:
everything

Cons:
well to be honest i have found some parts need to be modified because of those slight differences between parts, Specifically im talking about G&P trigger systems. The safety arm was too long in my experiences so it wouldn't engage properly, so i needed to shave that down a bit.

This also uses a proprietary tappet plate because of the grooves within the gearbox. So, its possible to make groves in another tappet plate, but its best to try and keep with this one.

Set up:

VFC High speed motor
Bravo standard ratio gears
Silent piston head and cylinder head
340mm rated ported cylinder
11.1 lipo
Angel custom THOR piston
Prometheus m120

i get about 450fps with .20's @ around 27RPS. I would definitely recommend this gearbox for any project, or just replacing a cracked gearbox.