I bought a used 20 gauge tube for the Encore without any chokes and thought I could go to Cabelas and get a few from their bargain cave.
HA.
None of them were listed for the Encore.
I finally measured the threads and found out the they were the same as the Winchester, Browning Invector, Mossy 500 Weatherby and Savage shotguns.
Bought this style and they all fit fine.