COMPATIBILITY: Fits Mossberg 3.5 AccuChoke 835 Ulti-Mag / 935 Magnum shotguns. TRUGLO BEST SELLER: The Gobble-Stopper is our best selling turkey choke tube and is made of precision CNC-machined high grade steel and is ported to reduce recoil. VERSATILE: Accepts most turkey loads, including Hevi•Shot (NOTE: Not for steel shot loads). NWTF-APPROVED: The Gobble-Stopper choke is endorsed by the National Wild Turkey Federation. FREE SIGHTS INCLUDED: Includes free TRUGLO Gobble-Dot Universal Fiber Optic Sights that quickly and easily mount to any ventilated rib shotgun.