The three are not the same and there are several more, and different, types of composite barrels Parker Bros. used on the early hammer guns.
The most resilient however, are constructed of Laminated Steel.
But FAR More Important than the type of composite barrels they are is the minimum wall thickness all around the barrel tube and for its full length. Further, the chamber length should not have been altered because this can compromise the wall thickness at the forward end of the chamber.
After all of these things pass muster by a qualified gunsmith well practiced in classic sxs guns, you still need to use LOW PRESSURE ammo of the correct length… which would be 2 1/2 inches.
Good Luck and enjoy your Parker!!
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__________________
"I'm a Setter man.
Not because I think they're better than the other breeds,
but because I'm a romantic - stuck on tradition - and to me, a Setter just "belongs" in the grouse picture."
George King, "That's Ruff", 2010 - a timeless classic.
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