[Kos-Mos]

It's a V3.

Best thing you can do is upgrade the piston to a Modify High speed V2 (the new white ones), M110-120 spring (should get you around 380-390 depending on your complete setup, bearing spring guide (metal, don't get the sprining ones), MASK piston head and stainless cylinder head.

If you have the blue JG motor, it is the best you can find for a setup like yours. I am running one in a 400 fps M4 using a 1400mAh mini... it rocks like no other.

You should not be concerned about mechbox breakage since it's a V3, but if it does break, get a 8mm KA mechbox. They are decent for the price.

Take this from my past experience in making and using a MG36...

Don't use a 11.1v LiPo, your drum won't feed it. I had to use a 7.4v LiPo with a race-upgraded motor (custom motor for a Mini-Z... made it quite a while ago and the car hit 100 km/h... not scale speed) in my drum to make it feed enough.

I also have installed a Prowin metal hop-up in a JG G36C. It fits no problem. You should know that you don't screw the front most screw of the mechbox at all. The hole in the hop-up is for testing outside the gun... but I have yet to make it work. Inside the gun it is a beast.