in my reading of 537e, I don't see where subversion is mentioned in the law, but in many cases officer discretion is going to ignore it. When the time comes to through the book at someone, that just becomes an additional item to tack on.
that said, I could see the clerk needing to tell you that you shouldn't cover the serial number because if they didn't inform you and it became an issue somehow later on, then you may try to point back to this encounter and say "I showed my gun to SBSO with the serial covered and they didn't tell me I couldn't do that, so I assumed it to be OK. If they had told me, I would have uncovered the serial number right then. I was 'entrapped' by SBSO's lack of action".
Just a hypothetical.
that may be true and as I mentioned before, it might take a court ruling to figure out exactly where that legal line is at with regards to installed accessories covering a firearm's serial number, when it is often done for "performance" reasons and not to conceal the firearm's info from others.
that said, I could see the clerk needing to tell you that you shouldn't cover the serial number because if they didn't inform you and it became an issue somehow later on, then you may try to point back to this encounter and say "I showed my gun to SBSO with the serial covered and they didn't tell me I couldn't do that, so I assumed it to be OK. If they had told me, I would have uncovered the serial number right then. I was 'entrapped' by SBSO's lack of action".
Just a hypothetical.
That said, in my research, S&W sells an M&P9c with the CT grips pre-installed, covering the number from the factory. Only rub is that since it comes with standard capacity 12-round magazines, they don't sell it directly in CA. Their suggestion to me when I was first looking at the 9c was to purchase the CA-approved 10-round package with the grips aftermarket.

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