They didnt have any recoil so shooting one in zero gravity wouldnt send the shooter flying backwards.

Weren't they the ones that went on the moon where there is gravity?

I dont think that there is enough gravity on the moon to shoot a gun and not be propelled backwards a little bit.

Well the point of firearms being supplied to Cosmonauts/Astronauts was not for use in space but for re entry in the untamed wilderness as the article states.

Also If I was in space I wouldn't want a Gyro Jet, at short ranges the Gyrojet is known to be ineffective because it needs distance to accumulate velocity due to the rocket powered rounds.

Um, gyrojets have less recoil, not none.

You can't have no recoil under Newtonian physics.

You can have no perceived recoil, by either throwing something of equal mass in the opposite direction at the same time, having an open tube that doesn't restrict the propellant, or venting your propellant to push the weapon foward to balance the recoil pushing it back.