Hatsan 125 Sniper .22 barrel movement up and down after rifle is locked

[need4speedtonka]

This my first post  not counting intro...I got this rifle month ago ,did some shooting short distance no scope on it.Did fine out of the box ,well I know needs to be brake inn and everything,but on the good day I had pretty nice groups.when I got it first I did checked the scrues and everything ,cant tell for sure.....but I thing I dint know any movement in barrel after was shot down.However now there is a play in it,i did take the stock off tight up the bolt which holds the barrel with the rest I belive is called reciver? .Anyways this is kind a worries me ,I mean with that kind of movement its about one mm maybe ,maybe more,would that couse the rifle not shoot strite? I know it probably does ,my question is that anyone come across problem like this? this is a brake barrel rifle but shoudtn things be extra tide for rifle to shoot correct? Any help would be great. It goes up and down not to the left and right,this is pretty tight.Thank you.