no i sure don't. it's kind of an oddity. with a fully loaded mag, i can shake the magazine with nothing to hear. i can then in turn shake the pistol without the mag installed, no rattle. once the mag is inserted it rattles. it's almost like the magazine is rocking back and forth in the magwell.
this isn't my video, but basically this is what's going on.
i have 150 rounds through it.
In the video, the cause of the rattle is pressure being placed on the magazine spring enough so that rounds (or at least a specific round) can move back and forth.
If your gun is rattling for the same reasons, you can try a couple of things:
1) tap the magazine so that the loaded rounds are all seated as far rearward as possible in the, apply pressure to the top round to depress the spring as much as possible, and smack the bottom of the mag to pop the spring a bit.
This sometimes adjusts the round/spring seating so they hold in place better.
2) use a different magazine for carry (this doesn't happen with all of your mags, does it?)
...it occurs to me to ask--when you carry, do you have a loaded magazine plus one in the chamber? Or do you start with one in the mag, then chamber one so the mag is one down? That can make a difference, too.
3) fill the entire magazine with silicone. No rattle.
(Please don't actually do that one.)
(Truthfully, I would just suggest #2. This doesn't happen with all of your magazines, does it?)
