"Therefore firing pins, extractors, extractor spring & plungers and many of the trigger group parts are the same as for the current model 870.
Operating handles are the same as the model 1100 or the newer 11-87. Much of the trigger group will be the same as the 1100.
The action bar assembly is different & only for the 58. And there were 2 different types of these depending on the date of mfg.
Buttstocks off an 870 will fit. Forearms will be a problem to find, as any of the newer models do not interchange. And used 58 forearms come at a premium price.
Barrels are obsolete, but new barrel can be made by utilizing a new 870 barrel and drilling a gas orifice hole to accommodate the gas."
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