Newbie gun enthusiast

Hey all,

I'm a newbie gun enthusiast. I'd like to buy a used gun (Sig P320). I came across calguns.net but I wasn't able to create an account. The other is gunsbroker where I did find the gun I'm looking for from a seller in North Carolina but they require a FFL. I'm thinking of using Reeds gun range or E2 gun shop for this. Please guide me and I'll be grateful for this. Thanks !