I'm usually headed TO Grand Rapids for my gun purchases. Silver Bullet Firearms in Wyoming. They sell NFA items (suppressors).
Jays in Claire is huge!
Skip Total Firearms in Mason. I used to go there a lot but their prices kept climbing pre-panic. I offered them a pistol for $400 and they countered at $300. They had the same pistol in blue (mine was a rare discontinued stainless) used asking $1k. Usually they paid half of the resale value but this time I was told they wouldn't make any money if they paid $400 for it. Crazy! I used to spend thousands there yearly but haven't been back since.
I hope you get to take your trip later! It sounds interesting to check out shops all over the state.