Also posted this on gunsmithing forum, but thought here might be a better place. Two of us are going to make a "poor man's double rifle" from side-by-side shotguns. Colonial chokes said theirs are too thick (the part that sticks out beyond the muzzles) for use on a SxS. Any one know of thinner rifled chokes? We are planning on using Stevens 311s or Baikel/Spartans.

I don't know if Briely makes rifled tubes, but they do install regular tubes in s/s. You need measure the OD at the muzzle to know if a tube will fit, the part that extends beyond the barrel can be turned down in a lathe to make it work with a s/s or OU, I had to do that in order to use the extended stee shot tubes for a weatherby orion ou.