100 USD
$150
single shot 30 30 with 32 gauge dart barrel have barrel need action
50-100 USD
The value of a double barrel Harrington Richardson 1900 20 gauge gun depends on its condition. This gun in excellent condition is valued between 180.00 and 240.00 as of 2014.
1901 single barrel shotgun, washingtion
$75-125, depending on condition.
You will have to measure the inside diameter of the barrel to find out if it is not marked.
fifty or one hundred dollars.
50-130
50-100 USD
You take it to a gunsmith who has the special tools needed to remove a barrel without damaging the gun.
50-200 USD or so
Unlikely that detailed sn data has been published.