The ATF doesn't give a shit about state laws and the MSP only gets involved if someone f***s up (which they haven't at the Mill). Chapter 140 Section 123 requires the local PD to do yearly inspections, and all the parameters are spelled out in there. If you're really curious, Google it and read the unpunctuated screed. Your eyes will bleed before you're done.
We had an issue with the inspections at first because the LPD wanted to do them the way they are described in Glidden's book, but Glidden was (and still is) wrong. His inspection checklist is a piece of shit. There are things he included that are not in the law, and some things in the law that he didn't even mention. We were able to work it out with the LPD, and they've been nothing but professional.