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4 inches including chamber.
No longer made
M38
50 or so
25-100 USD or so
25 - 100, if you can get someone to touch it.
.380 colt stick a pencil in the barrel, jamb a potato over the pencil onto the barrel, remove the pencil
Have it checkd by a good gunsmith before firing.
none
Take it to a gunsmith and ask for help
Ask a gunsmith for help
25-75 USD