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Beware.........the standard shotgun receivers and rifle receivers are not the same, different metallurgy, a shotgun barrel on a rifle receiver os OK, not so a rifle barrel on a standard shotgun receiver unless it came as a combo, all about pressure numbers. There's an SB1 and SB2 receiver for a reason, at least that's what I've always been told, the SB2 is an alloy steel made for the high pressure rifle calibers.
 

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All M158 (H&R Inc single shot) frames are ductile cast iron, so you're limited to shotgun and low pressure rifle like 30-30, 357mag, etc. Late M158 frames are pretty much compatible(when fitted properly) with modern( 1987> NEF/H&R 1871) barrels, earlier M158 barrels with snap-on forends will pose a problem with forend attachment, later M158 barrels had screw attached forends like modern barrels.

Tim
 

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Discussion Starter #4
All M158 (H&R Inc single shot) frames are ductile cast iron, so you're limited to shotgun and low pressure rifle like 30-30, 357mag, etc. Late M158 frames are pretty much compatible(when fitted properly) with modern( 1987> NEF/H&R 1871) barrels, earlier M158 barrels with snap-on forends will pose a problem with forend attachment, later M158 barrels had screw attached forends like modern barrels.

Tim
mine has a screw to attach the forend, so is ok to buy a 20ga or 30-30 barrel for it? will 158 swap with 58 barrels?
 

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Yes a 20 ga or 30/30 will be ok but fitting may or may not be needed. Here's a link to the FAQ's. Scroll down to barrel fitting. FAQs and Help (Broken Links)
The 58 and 158 should be ok to swap barrels as long as they both have threaded forearms.
 
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