Regarding Miroku and Ultra-Hi rifles, I can only say "It Depends"
I recalled Warnings regarding old Ultra-Hi smoothbore barrels:
There was a time when a problematic series of flintlock ML were sold by Ultra-hi which were 1/2 round- 1/2 octagon barrels.
Apparently there were some imported that had a 2 piece *barrel*, and some of these had internal "ledges". (yes the stock was a two-piece stock as well).
The concept of 1/2 round-1/2 octagonal must have been conveyed conversationally, because the resulting barrel was literally a bored octagon piece screwed onto a smaller diameter bored round piece.
These are usually flinters, almost always marked Ultra-Hi and/or Miroku.
the 'trade rifle/musket" in question looks like this:
http://www.gunauction.com/search/displayitem.cfm?itemnum=10224467
This is not to say that ALL the Miroku / Hi-Point musket have a 2 piece barrel, but such a significant number existed that they were banned from many rondy's or competitions in the early 70's after some problems occurred.
from :
http://americanlongrifles.org/forum/index.php?topic=13316.15
Dphariss
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Re: Broke my ramrod off in barrel while cleaning/STUCK
« Reply #26 on: November 29, 2010, 11:45:34 PM »
Quote from: bob miller on November 29, 2010, 10:27:11 PM
I believe Miroku made the barrels used in the Dixie gunworks guns.
They also made the 2 piece threaded together "1/2 octagonal" smoothbore barrels for "ultra-hi".
The one that was split for photos by the old Buckskin Report had a bore that was .010" out of line
at the joint. The reason it was looked into was that people were hanging up patches in the barrels
due to the mis-alignment of the bore.
So when I see "made in Japan" and "stuck patch" its the first thing that comes to mind.
But since this is stuck at the breech its not likley stuck at some joint in the bore farther up.
If its rusted that bad its junk in any case.
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and another link:
http://www.muzzleloadingforum.com/fusionbb/showtopic.php?fid/16/tid/239798/
informationally, yhs
shunka