Something to consider, the guns from Roland's world are just that - from his world. We've seen products from our world there but also things that don't exist. We won't really see it's likes here.

King drew a lot of inspiration from the Man with No Name series so the Colt 1851 Navy conversion should be the one to look to for a "real world" comparison although Roland's is not of this world. You can see more info here, http://www.imfdb.org/wiki/Good,_the_..._the_Ugly,_The

"“true-blue steel barrels, sandalwood grips, bores like mineshafts." Somethings are better left to the imagination I think.