just bought one in like new condition for 150$
1956
It is not recommended to shoot slugs with a power pack chock on a JC Higgins model.
Modified choke with the 28" barrel.
You don't give us the model, so it is hard to answer the question. Assuming the gun does not have an obvious adjustable choke, the choke is probably not easily adjustable. A gunsmith can open the choke (from Full to Modified for example) or can install internal interchangeable choke tubes (costs around $125).
No. The Model 66 does not have user-interchangeable barrels. Your existing gun could be modified by shortening the barrel, adapting for choke tubes and installing rifle sights. sales@countrygunsmith.net
1957 more likely 1961
50-200 depending on specifics
made 1952 by Sears/High Standard in good shape 100 dollars
The value of a JC Higgins model 2012 gauge 583.59 is $250.
Measure it, or have a gunsmith measure it, with a choke gauge.
A 1953 JC Higgins shotgun 12 gauge model 20 pump is values at about $150. It was sold by Sears Roebuck.
The choke you use depends on your target rather than the type of shotgun. For example: if you are shooting skeet, you would use improved or modified cylinder, but if you are shooting trap, you would use full choke.