They just fired their rockets to compensate for the inertia. If you want recoiless weapons in space, you could probably just buy a 1960's era Gyrojet pistol or

They just fired their rockets to compensate for the inertia. If you want recoiless weapons in space, you could probably just buy a 1960's era Gyrojet pistol or rifle. The launched rocket powered bullets instead of conventional ammo and because the rocket ammunition was self-propelled, it was nearly recoiless. https://en.wikipedia.org/wiki/Gyrojet https://en.wikipedia.org/wiki/Gyrojet Also, the weapons, especially the rifle, have this wonderful 1960's era futurist design to them. The Gyrojet weapons are probably worthy of their own posting.