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Old March 13, 2013, 08:55 PM   #2
Senior Member
Join Date: December 29, 2010
Location: Shoshoni Wyoming
Posts: 1,257
20mm is the same as 10 gauge (10 bore) so such a barrel is not that hard to find.
What type of gun are you going to be working on?
Muzzleloading or breach loading?
Is it to fire a bullet or a ball?

Ed Rayl can do that kind of work, as can Oregon Barrel I believe.
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