Rifle fire (4)

I believe the answer is:

sack

I believe this is a double definition.

'rifle' is the first definition.
(I've seen this before)

'fire' is the second definition.
(dismiss someone from their job)

(Other definitions for sack that I've seen before include "See 12" , "Plunder - large bag" , "Large bag; dismiss" , "Flour or grain bag" , "Plundering of captured town" .)

I've seen this clue in The Guardian, The Independent, The Times, the Sydney Morning Herald, The Telegraph and The Globe and Mail.

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