A couple of random thoughts and observations;
1) I haven't been able to locate parting lines on any of the 3 barrels I own in the Maynard line...two of which are definitely associated with 1873 Models. A small sample, but...
2) The breeching of Models 1873 and 1882 involves a hook at the front where it acts against the axis pin (a screw actually) while the lugs of the 2nd Model percussions I have seen have a full loop requiring the axis screw to be removed to unbreech the rifle.
C) All of the admittedly few '73s and '82s I have seen show the joint in the breech piece (behind the standing breech) where a wedge was taken out and replaced to contain the firing pin assembly while removing the part which held the percussion nipple and the flash tunnel beneath it. They also have the filled holes for the saddle ring and staple.
IV) All of the firing pin holes I have seen on '73s and '82s were waay big for modern primers, especially small rifle/pistol size.
All of that being said, I still would like about another half dozen to add to my personal stash! A 1st Model percussion would be nice, and one with a Hadley device, and of course a Model 1882 Number 16 in .25-20 SS, and maybe a Creedmoor for longrange, and... and... and...
Froggie