The Mossberg 835 Ulti-Mag is a pump-action shotgun built for serious waterfowl hunters who demand reliable performance in tough conditions. This 12-gauge (Model 63521) chambers the full 3.5-inch magnum round, giving you the payload and velocity to take ducks and geese at distance with confidence. The synthetic stock and Mossy Oak Shadow Grass Blades finish handle wet marsh environments without flinching, while the ported 28-inch vent-rib barrel manages recoil and swing naturally over decoys or across open water.
What sets the 835 apart is its Accu-Mag choke system—you get flexibility to dial in your pattern for whatever conditions you're hunting. The fiber optic sights cut through early-morning and late-evening light, making target acquisition quick when birds are working. At 7.75 pounds and 48.75 inches overall, the gun balances manageability with the weight needed to absorb heavy loads. The 6-round capacity gives you enough shells on tap without being unwieldy in a blind or over rough terrain.
Whether you're hunting the Mississippi Flyway or coastal bays, the 835 Ulti-Mag is engineered to cycle reliably through a full day of shooting—no babying, no fussiness. This is the kind of gun that earns respect through years of performance, not hype.
| Gauge | 12 |
| Action | Pump |
| Chamber | 3.5 inch |
| Barrel Length | 28 inches, vent rib, ported |
| Overall Length | 48.75 inches |
| Weight | 7.75 lb |
| Capacity | 6 rounds |
| Length of Pull | 14.5 inches |
| Finish | Mossy Oak Shadow Grass Blades |
| Stock Material | Synthetic |
| Sights | Fiber optic |
| Choke System | Accu-Mag set |
| Model Number | 63521 |
The 835 ships with the Accu-Mag choke set, which allows you to swap tubes to adjust your shot pattern for different distances and hunting situations.
Yes. The 3.5-inch chamber, ported barrel, and synthetic Mossy Oak Shadow Grass Blades finish make it purpose-built for ducks and geese. The fiber optic sights also help in low-light conditions typical of waterfowl seasons.
The length of pull is 14.5 inches, measured from the trigger to the back of the stock.
The gun chambers 3.5-inch ammunition and is built to cycle heavy loads. However, extended shooting with maximum-power loads will generate significant recoil; the ported barrel helps manage it, but consider your comfort level and shoulder endurance.
Firearm Shipments:
To buy rifles or shotguns, you must be 18 years old, and for handguns, actions, or receivers, the minimum age is 21. By placing an order for this firearm, you confirm that you are the legitimate transferee/buyer, meet the legal age requirements, and comply with all Federal, State, and local laws and regulations necessary to purchase this firearm.
We only ship firearms to valid Federal Firearms License (FFL) holders. At checkout we provide a FFL locator for your convenience.
We will need a copy of the FFL’s license to facilitate the process, kindly request your dealer to email us a copy of their FFL, as we cannot dispatch the firearm until we receive this document. It is imperative for the buyer to choose their FFL dealer, ensure they are willing to facilitate the transfer, and have them email their FFL copy to BOSQUE Outdoors. To avoid any confusion, the customer's name or order number must be mentioned in the email containing the FFL.
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