"Ball fences/Detonation - refers to the section around the top of the action body, the names originate from pin fire guns, Purdeys have been known to call this section the 'Detonation' as originally it would have housed the powder primed for detonation."
http://www.boxallandedmiston.co.uk/s...un-terminology
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"If there is a heaven it must have thinning aspen gold, and flighting woodcock, and a bird dog" GBE
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