I've never bought anything here, but I do love clicking my way through their site.
They don't have firearms, but I'm sure you could find a few milsurp ammo boxes if you needed some!
6,816 LBS of 5.56 mm expended brass casings
Or how about a Cold weather jacket (or 177 of them!?)
Or maybe you need 25 Bayonets & Scabbards?
I'm thinking about a MilSurp General Mechanics Tool Kit