Nerf darts, for a Nerf Ultra blaster (4)

I believe the answer is:

ammo

(Other definitions for ammo that I've seen before include "What's fired from a gun (abbr)" , "Slugs perhaps" , "Bullets and bombs, etc (abbr)" , "Bullets, say, in short" , "Bullets, etc. (colloq.)" .)

I've seen this clue in The Washington Post.

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