An FFL is $200 and is mainly for dealers.  If you own one or even 3 guns, you really don't need one.  An FFL only allows you to buy and sell guns, parts, and accessories.  Usually at cost instead of retail.  Unless you plan on having a large collection, you are barking up the wrong tree.  Plus, you have to be able to list a place of business, which can be your home, but it has to be approved by local law enforcement.  Which means no go, for us navy folk living in housing.