UE4 - Attaching gun to socket does not play animation

So i’m trying to attach the gun to the arms, which are playing an idle animation. I made a special socket called GunSeeSocket on the skeleton of the arms. I made the gun, called GunSee as a parent of the arms mesh and attached GunSee to the socket. In the editor it is attached and plays the animation (the gun) but when I play the game, it is attached but there is no animation, the gun isnt moving. I made the arms and another gun seperate, becuase that is what the player sees and the whole body is what everyone else sees. The position of the gun is random atm, dont want to bother setting it up, i would just like it to move as the arms do. The whole character and the gun which he has in his arms work perfectly.