A gun for everyone? (6)

I believe the answer is:

apiece

'for everyone?' is the definition.

'a gun' is the wordplay.
'gun' becomes 'piece' (piece is a kind of gun).
'a'+'piece'='APIECE'

(Other definitions for apiece that I've seen before include "A head" , "for everyone" , "For or by each one of group" , "Per person" .)

I've seen this clue in The Guardian.

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