[G.I. Joel]

Adjust the hop-up by flipping up the rear sight.
To make a custom more accurate hop-up and ONE piece barrel can be accomplished with a keen mechanical aptitude and lots of patience.
-I had one drawn up but, since I sold mine I didnt decide to keep it..sry
If you reload with the muzzle pointed down its less likely to jam.
File down/smothen out the gouge marks in the shells as they become weathered from use, it helps keep the shittier ones cycling.
The biggest performance inhibitor is air leaks. Its a better re-enactor functional prop, than a game ready piece.
Sell your soul for a tanaka, you'll like that much better!