set the springs legacymode to 2 (its in the script menu) by doing so you can add more damping (like -1)
so if you set legacy mode to 2 and set damping to -1 you get a lot more speed out of it (100 rad/s)
how this works
if you look close at the bullets you will find a spring
that is what makes the bullet work and there is a part holding the bullet together
the trigger kills that part making the spring expand and another part kills a part on the bullet head killing the spring
and the trigger i scripted
set the sim speed to 0.1 and look close at the parts while fireing the gun
if you want more info you can ask one of the good gun builders for help
nice job vaidas
vary powerfull engine
and i tested the engine by starting it on gear 5(trying to accelerate from stoped to full speed only using gear 5)
9/10!
i can upload an improved version for you if you want
all i will do is improve the drivetrain and add a clutch to make it run better
or i can just tell you how to improve it