So they are basically creating a sanctuary state for Missouri like most of the people on the boards here hate. I mean, it sounds like they are creating a "sanctuary state" for the 2A which is well liked here, but there's a certain amount of duplicity in saying how awesome that is when railing on liberal states for being "sanctuary states" for issues like illegal immigrants.
At best, the bill --- in my reading of that article, and keeping in mind that I'm not a lawyer --- says what you stated: that they won't cooperate with the feds. Great --- but again, do you want to be the first person that the feds arrest with an unregistered SBR or machine gun? Because it does NOT say that the state will pay your legal fees. That it will shelter you, and protect you and save you from federal custody. So again, cool idea bro, but that doesn't exactly "Take on All Federal Gun Control: Past, Present and Future" until they're going to have a strike team ready to bail Joe Bob out for his illegal possession of (fill in the blank here).
Here's another hypothetical --- would they stop doing 4473s up there? They could say alllllll they want that the FFL's don't have to, but I'd wager that the FFL's would still do them even if it is an infringement that the state doesn't recognize. Why? Because of the first "F" in FFL. Their license is Federal and they'd be arrested and tried by the Feds for not complying.
Again, it is saying that the state will not corporate with the feds. Yes it is sort of a sanctuary states. Over time Republicans do learn to use the enemies tactics against them. You want to just sit back and cry, go ahead, but this is a practical step that the Democrats can not whine to much about since they are doing it for illegals.