FWIW, any Home/Auto chain store, and most truck/automotive parts store should carry a small can of penetrating oil (very common) - which you can flood around/down the stuck guide rod (with the barrel set held upright in a padded vise/whatever), and let soak for a few days, replenishing the flood as req'd.
If it's STILL "stuck", I'd square off the end of the guide rod with a file as best I could & drill a small hole in the end of it, about a 1/2" deep, to thread for a small screw - which should give enough purchase to pull it out with a pair of visegrip pliers.
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