I just had my cz for three days and ive gone through 350 rounds and its awesome.. but my question is..when i take the mag out and i try to lock it .. it doesnt lock.. i slowly put the mag in and i notice that when it goes all the way in it pushes that one thing you press to make the slide go back into place..it pushes it up so when the mag is in and i push the slide back it locks.. is this normal? shouldnt it lock all the time? im such a noob sorry guys but can someone help?so when the mag is out it doesnt lock.....