Custom Guns on CS:S Maps

I run a server that is running TTT on the default CS maps. The only problem is that I have custom guns that will spawn in the server and they will no spawn on CS maps. Is there any way that I can have these guns spawning? I have tested them on custom maps and they work fine.

Yeah, just edit the arming files that are included with ttt.

Where is this arming file located and what do I change within it?