File:BL 6 inch gun Mk IV & VI breech mechanism and percussion lock diagrams.jpg
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![File:BL 6 inch gun Mk IV & VI breech mechanism and percussion lock diagrams.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/a/a2/BL_6_inch_gun_Mk_IV_%26_VI_breech_mechanism_and_percussion_lock_diagrams.jpg/800px-BL_6_inch_gun_Mk_IV_%26_VI_breech_mechanism_and_percussion_lock_diagrams.jpg?20161007094627)
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