bolster - support and strengthen. On a shotgun, bolsters are the metal part of the frame the is behind the barrel breach. In the pictures seen here, the firing pins that the exposed hammers strikes passes through the "bolster" and down to the shell's primer.
On most Parker hammer guns, these bolsters are not a simple round metal supports but rather are sculpted. Parker shotguns with internal hammers have the round bolsters.
From the discussion here, it appears that some of the late model hammer guns were made in the style of the hammer-less guns. It seems strange that Parker would go to the expense to redesign the hammer gun frame during the transition to the new internal hammer design?
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Threaded Mode