The Mossberg 835 Accu-Mag Choke Tube is what you need for your 835 or 935 shotgun. This Choke tube is in 12 Gauge, Ulti-Full Turkey, and comes in a black finish.

Specifications and features:
Fits: 12 gauge Mossberg 835 and 935 shotguns
Ulti-Full Turkey Accu-Mag choke tube
0.765" constriction
Lead only
Black Finish