Has a absolutely tiny amount of play in my ATP but its not noticeable at all until you actually shake it trying to get it to wobble. It do take a few cycles to break in but once their broken in they are flawless.
this mag is great! it more than doubled my ammo capacity in my ATP and my FPS has gone from 270-280 to320-330 (don't know how the FPS worked out but chrono's don't ly and who cares anyway.) i would highly recomend the mag.