This is just what I would do if the barrels have a weep/drain hole in them where they were reblued.
With a squirt nozzle I would spray a good quality gun oil in the hole. With a rubber tipped air nozzle at low pressure, I would put some air pressure into the hole. If oil comes back out the hole and no where else, good. If oil comes out at a very small spot in the solder, then probably still OK
If oil comes out everywhere, top and botton, then a hot bluing job was probably done at some point, even though the last job may have been a correct rust bluing. Barrels would probably have to have the ribs relaid and reblued. May hold together, may not.
Just my two cents.
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