It should take the standard Browning Invector choke tubes, along with all Model 1200, 1300, 1400, 1500, Ranger and standard Winchokes. Everybody stocks Invectors. DON'T get the Invector-Plus tubes, they're newer and won't fit.
There's an interchange list at
www.trulockchokes.com and they call them the Win-Brn-Moss style. Lots of makers use other maker's thread patterns, etc. The guns aren't the same, but the tubes fit.
You can look up Browning Invector on the list or Win 1300 - they take the same style.
John