Head over to oldgobbler.com and look at the Browning and Winchester threads.
Same barrel on the Browning Gold, Silver and Maxuus as well as Winchester SX2, SX3 and SX4. All Invector+ tubes.
There is a Rob Roberts tube for sale here in the classifieds. Should be a good choke and is a good buy.
https://www.24hourcampfire.com/ubbt...turkey-chokes-invector-plus#Post12943098