Correct me if I'm wrong but I've just re-read the rules and nowhere in the rules does it say we cannot disclose locations of purchase, we just can't advertise guns for sale.
8) No posting of guns or 18+ items outside of specified areas
There will be no posting of guns or other 18+ items for sale or looking for in Signatures or other areas where you don't need to be age verified. Items are to be sold in their proper locations. Guns go in the gun section, gear in the gear section, NAR in the NAR section.... Failing to do this will get you a warning, particularly with selling guns.
Guardians of Asgaard - KF32
VFC H&K 416C
VFC KAC SR16 JL Billet SBR
TM FN Five-seveN