I have an Airsoft Megastore Armory AMR4 MK1. Link: AMA AMR4 MK1 EBB MOSFET enhanced I'm wondering if anybody has this and opened it up. I'd like to know what can be upgrade and what doesnt have to. Eventually I'd like to upgrade some things, or get someone to upgrade them. But otherwise just to further my knowledge of the gun. I have no knowledge of teching so I'm not taking any chances by taking the gun apart. So I'm asking here if anyone has any knowledge of this gun and basically whats inside.