I bought a new 3rd gen PT140 last week and put 90 rounds through it. Even before firing I noticed that there is a little play with regards to slide to frame fit. If I swing the gun side to side I can make it rattle a little. There is also a little bit of play up and down. The play is worse with no magazine. With a loaded magazine, the rounds push against the slide and hold it tighter. Is this normal for the Millenium Pro series? If so is it to ensure reliablility?