Finally, IT'S DONE!
This thing works awesome. Maybe the spread is too much, but I can change that easily later.
I've been working on this one for some hours (say 4) but I had to redo a lot of things 'cause they worked badly at 200 Hz (like the elevator thingy system: I tried to replicate ngphil's system from the Mossberg but I ended up using something like the Model 1897 from homieeee.)
The gunpowder has a little bit more of duration and more delay than in the gas-operated, so it's even better!
It has a muzzle brake from my bolt action rifle (which I'm gonna upload in the next hour or less)
v2: I found something weird and fixed it
v3: I found out that this behaves perfectly when in movement! So I added a key to cycle rounds, and put springs.
Someone wants to make it a skin?
PLEASE RATE AND COMMENT!