>>11909807Regolith is significantly more aggressive than even sand and cold welding is a non-issue on earth, same goes for electrostatic attraction of regolith.
In addition to that quite some weapons used right now date back to WW2 in one way or another.
Best examples are the Browning M2 and the german MG-3 aka MG-42.
Ballistics also work a little different in space as the bullets velocity isn't changing much due to the lack of aerodynamic drag.
Recoil management is also important as the lower gravity makes it harder to controll recoil.
So you want something to prevent cold welding, something to keep regolith out, a lightweight projectile and a high muzzle velocity.
In my case the pressurized body and MoS2 grease coated ammunition take care of the cold welding and regolith.
The smoothbore low caliber archives high velocity at low recoil.
Tumbling of the projectile during flight isn't an issue here as there isn't an athmosphere that makes it change trajectory based on its angle.
