Ada is near completion, just some hair details to add.
Aren't you a little short for a stormtrooper?
The rifle is a magnetic linear accelerator, the smooth barrel housing contains coils that are charged by the chambered round.
In game terms it’s a ‘Capacitor Rifle’ each shell is a highly charged capacitor with a ballistic tip coated in Nano fibers. The capacitor charge powers up the coils in the barrel and accelerates the projectile much faster than conventional solid or liquid combustibles. It will punch a small hole through very thick armor. A nasty rifle with a big kick, the Valkir use a similar weapon but they ware power armor and have considerably more mass to deal with the recoil. Ada has learned how to lean into the shot and lock her body into position. When the round is discharged she will remain standing but is driven back a foot or two.