Just got done shooting and cleaning my new MK9. I notice there is a bit of play in the slide, from side to side. If I grab the slide at the muzzle end (gun uloaded of course) I can move the slide left to right, just a bit. It seems to shoot just fine. Never noticed this on any of my other semi-autos. Of course, the gun is brand new so I'm looking for flaws , just like a new car.