Have the option off when you're looting and see melee/guns among the loot. Gather the loot, and turn the option back on.
Also, turn the option off, when depositing or withdrawing any weapons/guns in the locker back in base and turn it back on when you're set.
Forgot to mention this also applies to outposts too.
[Edited by kissmejohnjohn, 12/16/2013 8:22:00 PM]
Found your original answer on page 40. Thanks, bro!