[MaciekA]

You can take these ridiculous plastic beaters very very far. Nobody will suspect anything until you're out in the field.

Mine has a version 3 Lonex gearbox / motor / motorcage, Extreme Fire SW-SF MOSFET, flat hop bucking/nub. Completely rewired, XT60 connectors, etc. The handguard and outer barrel have both been gutted and sanded and cut to shape (with a Dremel tool) to fit the max size of battery I can manage to get in there. That and I've thrown an M4 magwell into the thing (also did some sanding to it to improve feeding).

It's plasticky and squeaky but it shoots like a champ and is light as a feather.

If your JG G36 is 4+ years old I assume it's also possibly got a semi-clear body so you might want to find some Krylon Ultraflat black and give it a good spraydown.