Crossword Genius

Firearm part (6)

Ross

I think it could be either:

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5

6

breech

(Other definitions for breech that I've seen before include "Bit of gun" , "Opening for loading a gun" , "(Half of) lower garment" , "Back part of a gun barrel" , "Opening in the barrel of a gun to load bullets" .)

I've seen this clue in the Evening Standard.
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