In multiple servers, I have tried to search for rifles at military bases, but lately I have ran across what I can only assume is a bug. I enter a Tent or Barracks and find anywhere from 3-5 SK 59/66 Rifles in various conditions. They are the most Prevalent at M B KAMENSK, but I have also ran into this problem at Vybor.
In my 2 months of testing this, I have found numerous (possibly 100+) SK 59/66 Rifles, a handful of Vaiga Shotguns, and 3 KAS-74U Rifles. Not a single higher tier rifle.
*Note: I understand loot spawns are percentage based, but the likelyhood of 3-5 of the same rifle being in the same building/area are slim to none (or at least should be), so I feel this may be either a bug or a percentage mistake on loot spawn.