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"Why do some FFLs refuse to take a shipment from an non FFL? Is it illegal for a non FFL to ship a gun to an FFL?
What does the law say about this and where can I find it written?"

My understanding is that some FFL holders are leery of doing this because if the firearm ever proves to previously have been stolen or used in crime the burden of explaining its acquisition would then fall on them. If a firearm is shipped to them from another FFL holder it takes them off the hook.
I don't believe you'll find this in any published information from the BATFE.
N.B. When the gun club I belong to takes any firearms in trade the serial nos. are reported to the police agencies to ensure that they are not stolen. I believe the pawn shops adhere to this procedure as well.
Jim


The 2nd Amendment IS an unalienable right.