I don't think he really wants to change the stock.
Anti-gun State police interpret Attorney General's (long ago deposed, anti-gun Kelly) interpretation of the law.
Present "pro-gun", elected, 2nd term republican AG has no balls to re-interpret the law correctly and caters to enemies of 2-nd Amendment.
He's a power hungry politician doing what's best for him, not the state's Constitution.
Antis, police, libs, leftists and Marxist scum love this pretender of gun rights.
To make the story short, folding stock rifles must meet 26" length requirement with stock folded and muzzle device removed.
This is the decree that contradicts Michigan law and Constitution.
Many, if not most of Michigan gun enthusiasts (second class citizens), do not wish to screw up the rifle by welding anything to the muzzle and would rather settle for non-folding stock.