100-300 USD
C-lect choke is an adjustable choke system that Mossberg implemented on their shotguns pre-1977. After 1977 they went to the accu-choke system. The choke is adjustable between Full, Modified, and Improved Cylinder. It is, however, not recommended for use with steel shot.
Can you Yes, should you NO. a full choke should not be used to shoot slugs.
mossberg 385ka bolt action
Some bolt action shotguns had an adjustable choke, and it is generally NOT recommended that slugs be fired through those. If there is no adjustable choke at the muzzle, your shotgun should be fine. Stay with rifled slugs.
100-200
Mossberg has a web site.
About $100, depending on condition. The Mossberg bolt action shotguns are inexpensive, but the .410s seem to bring a few $$$ more.
no
the 410 mossberg model 183d-a is a bolt action 410 gauge shotgun with a tree round mag well and has two interchangeable chokes full choke and modified
80-200
One was purchased new in 1974.