There's really no excuse for an FFL01 not knowing how to handle the FFL03+COE exception for the 3-in-30 rule.
It's a checkbox/dropdown with description right on the DROS form. All they need to do is read what's already in front of them.
Same FFL03+COE also gives you an exemption to the 10 day waiting period, even from a dealer, when purchasing a firearm that is C&R eligible.
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I have had an FFL01 (one of the employees) say they couldn't release my 4 firearms to me after the 10 day period because "that's not a thing".
Another employee had to keep telling them it was for a couple minutes.
It even said it right on the DROS like above.