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Greetings, and welcome to the fray! Ah, the infamous P.O. mag rattle. The problem, at least as I've diagnosed it, is with lower intermediate cartridges nosing up against the inside of the mag body and lightly "sticking", allowing those just above to free-float. If you doubt this, try the following: Next time you get the rattle, depress the cartridge stack just enough that the top cartridge moves visibly downward, thus loading the entire stack. Now shake the mag while under compression. No rattle, right? Now release pressure and re-shake. Our friend Mr. Rattle has likely returned.

There are 2 cures that I'm aware of. One involves using an aftermarket follower, such as the Arrendondo (sp.) piece, which, I believe, slightly changes the pitch angle of the cartridge. The other involves using ammo loaded to a shorter COL than the max. of 1.275". HTH.
 
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