You bad, bad person. How DARE you load more than ten rounds in your magazine?
Seriously, though, I don't know of any cop (myself included) that gives a rip if a private citizen has a high cap or not. I have seen LEO marked hi-caps on the range in the hands of private citizens. I didn't give a durn, didn't even address the issue, did'nt even identify myself as a cop. It's a non-issue to me.
Still, there are some folks out to make a name for themselves. And, you don't know who is on the range with you. One time I found myself holding an in depth conversation with a guy on the range. I showed him my Glock. I cleared the weapon, and he saw the LEO-marked hi-cap. He started acting a bit standoffish, then asked me if I was a cop.
I said yes, and he asked to see my badge and commission card. I said, "I have no problem with that--but why?"
He then pulled a chain from under his shirt, showing the badge of a Deputy US Marshal.
I was GLAD to show him my credentials then!!
So, be careful!! It's not worth going to jail over. Besides, you risk a healthy fine, and the permanent loss of your right to own firearms. All for a stupid piece of metal and plastic.
Which reminds me...........elections will be coming up shortly........