Jonathan,

There are "old" shotguns with a adustable choke called a "polychoke".

Modern shotguns do NOT have adjustable chokes !

They do have chokes that are threaded so that you can screw them in and out.

So, do yourself a favor and get "extended" chokes so you can change them (screw them in & out) without needing a tool.

Second, get three (3) different "sizes" to start; Improved Cylinder (or Skeet, better yet, as it is good to practice with also), Modified and Full.

Third; Please read a little bit about chokes. See link below (Briley is one of many manufactures of shotgun chokes).


http://www.briley.com/understandings...nbybriley.aspx

Hope this helps............and good luck !!!