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Joe Mac
Joe, this is very interesting and useful info. I did notice yesterday that neither rattles if not "fully" loaded with 12. I may download and follow your lead there, as it upsets my OCD as well.
More interesting yet...these are Gen5 flavor of the 12 round mag. Same but for the orange follower.
Yesterday, on my last string with one of the 12 rounders, I noticed I had a FTF with a round that was nosed into the ramp. I did a tap, (no rack), and fired the round off and the rest was as it was before...flawless.
I noticed when I went to pull the mag out, that it was not fully seated and I wondered if I could have failed to seat it properly, which I was pretty sure I hadn't done...and more likely, now, in light of what you mentioned, probably applied a bit of pressure to the mag release while firing.
This may save me some grief on two counts. Really appreciate your jumping in here with your observations. I owe you a cold one.
ETA: And done. 11 in each. One in the gun. One as a spare. I'll carry the 10 rounder if necessary for concealment. I shoot either as well. But clearly the master grip is better on the larger mag.