A friend of mine has a set of 28" ultralite briley companion tubes with extended screw in chokes. They came out of a krieghoff which i am pretty sure interchanges with invector plus. Krieghoff bore is 0.742 as is invector plus. If you are interested, let me know and I/you can verify with Briley and I can get you his contact information. He wants 325 plus shipping. They are in excellent condition. He purchase 20, 28, 410 from a guy on here and the 20 will not go in a mobile choke barrel.