It would be easy with a spanner that fits several size diameters and has a hinged claw. You could make one by drilling a hole in 1/2 inch aluminum stock the same size as the od of the nut.Once you drill the hole you drill and tap for a 5/16x24 thread next to the hole and then cut a slot straight through the threaded portion.Slip over the nut and clamp it up and smack it with a dead blow hammer.I use rosin all over the area that you are clamping on,it will help the wrench grip and not gall the nut.Take a look at the wrench on sss's site for the smooth nut they sell.That way you will understand how to make one.You can have a barrel made from an adams and bennet replacement sporter tube from midway.Sounds like a neat little project.Incidently,your barrel may have had some real old 30-30 cartridges shot through it and they were black powder way back when.30 caliber and 30 grains of black powder in the old days.
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