Bullets etc (4)
I believe the answer is:
ammo
'bullets etc' is the definition.
(abbreviation for ammunition)
This is all the clue.
(Other definitions for ammo that I've seen before include "Shot" , "Bullets, shells, etc. (abbr.)" , "What's fired from guns (abbr)" , "Bullets etc.(informal)" , "eg Bullets, shells" .)