There is a very annoying bug in this game whereby instead of adding my troops to an area, the game simply removes them instead. I click to add 20 to a region, I add them one by one, and then click "okay" or "end turn", and poof - they're gone, and my troop count for that region is back to where it started. Unless this is an undocumented "A.W.O.L. feature", please fix :)
The Barret is a sort of "secret gun". Most people will miss it because they stop searching for weapons after the weapons rack is full. The Barret is the last gun you'll find, after the AK-47. Just keep searching for a day or 2 with alot of people and you'll find it. It sits on the table once found.