Yeah, I didn't do next to nothing, much of the scripts had some very strange decisions, like for the recoil script to work, I had to put the muzzle on the sprite offset, this messed with the muzzle flash, so I had to redo that, too.

It wasn't all just beens and poppies, I did do work, in fact, I did just as much work as someone would have done on any gun without lua + all the problems that I encountered with lua/lua related things.

I am working on a BR, I have a great way to shoot off three bullets with ini only, I just don't know how nice it'll look.

Mehman realistic trajectories would mean that the bullet would go straight for a few thousand pixels and get there in half a second. From a pistol. It might not come out of the barrel as straight as a sniper round but at the scale the game is played at it would be pointless.
You want exaggerated drop and drag, surely, as well as likely reduced sharpness over distance with a script on each particle.