Crossword Genius

It makes the bullets go round (5)

Ross

I believe the answer is:

rifle

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But I can't explain it at all! Could you help me understand?

(Other definitions for rifle that I've seen before include "One that has stock" , "Go through in search" , "Search and rob for army weapon" , "Firearm - plunder" , "Search and rob - with long gun?" .)

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