CaptainDumbass

Unless its broken leave it be man,one of the lads I skirmish with has a stock one he uses propane (it shoots a fuckin dream) and runs around with extended mags being a nightmare to the other team,looking at your loadout preference I'm guess you're a CQB man so if you haven't already what about a torch and some mags to go with that slick pistol you've got,oh btw I'm not in the least jealous🙄

There are T&Cs you sign up to when buying a GM. One of them is that you won’t upgrade it. Honestly you won’t be able to upgrade it from where it is, you want something to upgrade then buy a spare hi capa! My GM is annoyingly fantastic.

Sorry chaps. I did a silly and upgraded it anyway. 
Maple Leaf hop unit & 6.01 inner barrel with Autobot 60 bucking and its already shooting even better lol.

Short stroked it simply for gas efficiency and faster shots. 

Nine Ball gas routers for better sealing/ efficiency. 

New magwell for the looks.