Literally know nothing about this; Possibly JG? I bought it last year and it just arrived at my house. Looking to sell it because I already own an mp5. What I know is broken- Charging handle, gearbox, and flashhider. The receivers are both metal and this is a very heavy smg. Very well built exterior. Internals- not a clue. Honestly just selling it to pay for new truck stuff. Wired to the rear with brand new deans connectors. Everything shown is included. $55 shipped OBO. Thanks