Hi, i'm brand new here, hopefully this is in the right area, feel free to move it. I have my XDM 9mm 4.5" sor sale/trade on ************* I want to sell, and re-buy the same gun in the 3.8" compact version for easier concealment. I got interest from someone, who says they hold an FFL and is out of my homestate of WI. I agreed to the deal of trading mine, towards his +$100. Is there any way to verify if someone is legit that holds an FFL? I emailed him asking for reassurance on this whole process, and also asked if he has a storefront or anything. I just get a funny feeling sending someone $100, and then shipping out my $600 gun. Any help or direction would be appreciated!