I ran across an old 870 wingmaster 16ga.   its a tight gun with a lot of life left in it.   I hadve had several offers on it ,  but I love the way it feels.   However, there is a problem,   it has a improved cylender fixed choke,   and I have had no luck finding another barrel .   I was wondering if anybody can help me find someone to put screw-in chokes in it.  I know the choke tubes aren't easy to find either.   But I sure would love to take the old gun squirrel hunting with my dog,  and an IC choke jut wont reach the top of a big ole redoak.    thanks in advance for your help.