Some of mags rattle too. I've found that not all mags or bullets are created equal. I have swapped around springs and followers and that helped. I've noticed some cartridges have a different overall length than others and when these are loaded first they rattle. Some of my reloads did this so I carefully adjusted OAL. But I have found that if you do what Soybomb says and top off the mag the pressure stops the rattle. Hopefully you will check all you gear for noise reduction before a snoop & poop. Besides after the first shot the rattle won't matter anyhow...[b said:
PS. Bend in guide rod is normal and of no concern.