The three level office building with the staircase in the center, always has had a gun in the top most room (the smallest floor).

However, not always ammo.

If this is true, you should try and reproduce it in a more controlled environment.

As your post stands now it just looks like whining because your enemy didn't die fast enough.

I found another work around for this. Drag the flash light from the pants on the ground ontop of another item (like tuna) in the pants being worn. It will bump the tuna to the old pants and successfully move the flashlight to the new pants.

Then the tuna can be moved like normal to the new pants.