A lot of recoil suppession systems direct the exhaust gasses somewhat backwards, and would work to their normal effectiveness in space. This is most common with artillery. What the gun you mentioned does is kick the back of the gun up at high frequency (and pull it down slowly) in order to attempt to keep the barrel angle from changing while shooting. This would have almost no effect on the recoil push in space.

The cold is not a huge issue. Space is an insulator, so as long as you don't leave it in space for a long time without holding it, it should be fine. Overheating would be a bigger issue, but it would still be somewhat useable. Vacuum boiloff of lubricants and degredation of explosives would be an issue, but I would think it would still be useable.