Have it checked by a good gunsmith and ask for advice.
No
Many of the Mossberg bolt action shotguns used a removable choke, not an adjustable. Sold under the name C-Lect-Choke, this was an external choke that could be unscrewed with a special wrench, and a different choke screwed into its place.
You will need to change barrel's, a accu choke is not on a slug barrel.
mossberg 385ka bolt action
300 or so
Mine is externally threaded on the barrel. The sight is a set screw to lock it in place. It is also has solder in the threads
A Mossberg 410, home defense, or a 18 inch barrel 20 gauge Mossberg 500 youth model with accu choke . Between $250.00, and $350.00
Your question can't be answered as written. What Model? What are ALL the markings? What gauge? How long is the barrel? What type of finish? Mossberg 500C, 20 gauge, 26" accu-choke, serial number K064007, checkered wood stock, blued barrel, vented rib barrel.
Mossberg makes an 18.5" personal defense/home defense/slug barrel for the 500 .410. The cost is approx $75 delivered via fedex. You should contact Mossberg directly to place the order. It's cheaper than Brownell's, Midway USA, Bass Pro Shops, etc. They get them from Mossberg to sell to you at a higher price.A NOTE OF CAUTION: Mossberg does NOT, repeat NOT recommend using slugs through the standard full-choke barrel. Using slugs in this barrel could bulge or burst the barrel.
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.