whoa! save your self alot of money and find a good gunsmith.....he can make your choked barrel accept choke tubes and the ones ive seen done look and work fine....that will save you tons.....i use a i/c or modified depending on what shot i have and how they are flying.....modified with a 12 ga though is alot....you either miss because its too tight or POOF you get a bag of feathers to bring home.....with the 12 ga i usually use the i/c.....but buying a new barrel will be 100-200 bucks easy....a choke tub job will be maybe 50 tops i think the buy around here does it for 40 with 1 tube given to you i may be wrong...