Through Bolt-type receiver with buttstock removed.
View from end of mounted stock with buttplate removed, showing head of Through Bolt.
Through Bolt - A simple method of attaching a buttstock to a break-open firearm's receiver. Rather than using the traditional English method of upper and lower tang screws, augmented by positioned triggerplates, action screws and triggerguard screws---one long bolt only, extends through a longitudinal hole in the end of the butt, through the wrist to the rear of the receiver. The steel bolt has the advantage of reinforcing the weak wrist area as well as snugging the stock tightly against the receiver, even in the case of less than totally perfect inletting. It has the disadvantage of making it more difficult for a gunsmith to bend a stock for better fit to the shooter. Common on Browning Superposed and Perazzi shotguns. Normally built with a short triggerguard tang for ease of disassembly.
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