Have to agree with pdog, sounds like one item had some bad threads (new barrel most likely) and it messed up the threads on the other bits when you tried threading on the nuts or it into the action.
Expensive solution would be to purchase a tap and die set (4D Reamers may rent them as well). Other option would be to have a gunsmith chuck them up in his lathe and check/chase them.
Don't beat yourself up over it, it happens to the best of us. Just last month I buggered up the threads on the engine case mounting boss of a brand new motorcycle with just 3 miles on the clock. I had a heck of a time running a chasing tap in from the rear to clean them up as access on the back side where the threads were still good was super tight. I could rotate the wrench maybe 1/8 turn or so at a time and the threaded bore was just shy of 1-1/4" in total length. Suffice to say it took me a while! lol
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