Check out Foxridge.com, or GreenMountain's web site.
The White Mountain has a 15/16 barrel to round and I believe any of Thompsons 15/16 octagon barrels will fit. the WMC is a 21" barrel, and this could be a prob, if you just want the carbine barrel. I have a WMC 50 cal. and have been thinking about getting another longer barrel for mine. Say like a 26" Renegade type.
Thanks for the heads up. The original rifle my brother had was .54 would it be the same size for both calibers? I will ask him if he would be interested in it. If you are truly considering selling it, please keep me in mind. Thanks again for the info.
The .54 is one inch, green mt used to have a 15/16 replacement barrel but I think its discontiued. As far as renegade barrels, they are the right width 1 Inch but doubt the thimble would line up. You could probably get it customized however. Mike
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