There isn't a registration fee for guns "purchased" at a gun store. They will charge a small fee for doing the transfer paperwork. I believe A3 gets $50 for that. You should only have to fill out a 48-10 form for the state and a form 4473 for the feds.
When i was at the store they had a sign stating no additional transfer fee,to me that says no cost.but call to verify
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