TAC is one of the few places where you can find airsoft guns, and I mean real airsoft guns. They carry Automatic Electrics and gas blow-backs, not just the cheap spring guns like most places. They can also modify or upgrade you airsoft guns, to get some more feet per second or what have you. Repairing is also in their arsenal of services.
Besides airsoft, they also carry real firearms for those who are interested, as well as the related equipment and ammunition.