I have a K40 Elite '98. I can check it out to see how it does and let you know.
Okay, I just came up from the basement where I took my K40 Elite '98 out of my safe to check it out for you. With the magazine in place and the gun uncocked and unloaded, if you shake it back and forth sideways there is some rattling. If you remove the magazine and do this, the rattling increases. The rattling is due to the slide moving back and forth sideways on the rear portion of the frame, not fore and aft. I didn't load the gun and try this but as I recall, it does not happen when the gun is loaded.
Hope this helps.