Butch,

show me the law that says you must have the FFL in your hand.It does not exist,only that they must have one. !
You can send say Remington,Kimber,S&W,Ruger a gun for repair and they will not send their FFL to you !

Butch, lots of "he said she said","look it up" that means nothing.Show me the rule.

BTW,the BATF says if your "in the business" so your brother in law does not need a FFL to repair/restock or whatever your gun as long as he is not "in the business"

and here is the rule;

"A person conducting such activities as a business is considered to be a gunsmith within the definition of a dealer. [27 CFR 178.11]"

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