Description

The Mossberg 835 Ulti‑Mag is a pump‑action 12 gauge shotgun built to handle a wide range of shotshell sizes, including heavy magnum loads up to 3.5″ in length. Introduced as the world’s first 3.5″‑capable pump shotgun, its overbored barrel dimensions and rugged construction aim to deliver denser, more uniform shot patterns and reliable cycling for demanding hunting applications such as turkey, waterfowl, and field use.

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Specifications

• Model: Mossberg 835 Ulti‑Mag 
• Type: Pump‑action shotgun
• Gauge: 12 gauge
• Chamber Size: 3.5″ (accepts 2 ¾″, 3″, and 3.5″ shotshells)
• Action: Manual pump with dual extractors, steel‑to‑steel lockup, twin action bars, and anti‑jam elevator
• Capacity: 5 + 1 rounds
• Barrel:
  • Type: Overbored smoothbore (built to approximate 10 ga diameter to improve pellet distribution)
  • Vent Rib or Plain: Many field/turkey/waterfowl variants include a vent rib and fiber‑optic front sight
  • Length:  20″
• Interchangeable Chokes: Compatible with Mossberg ACCU‑MAG choke tubes for pattern control on various loads and seasons
• Sights: Many models come with fiber‑optic front sights and some with drilled/tapped receivers for optics bases
• Safety: Top‑mounted ambidextrous tang safety
• Stock / Furniture: Synthetic
• Finish: Black or camo finishes depending on variant
• Weight: Around ~7.5lbs
• Intended Use: Hunting (especially for big game birds like turkey and waterfowl) and general field use.

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Design & Features

Overbored Barrel

Unlike many standard 12 ga barrels, the Ulti‑Mag barrels are machined to approximate the diameter of a 10‑gauge bore for the entire length. This reduces pellet deformation, helping to produce tighter, more uniform shot patterns with heavy magnum loads.

Magnum Shell Handling

Chambers 3.5″ shotshells — longer and more powerful than typical 2 ¾″ or 3″ loads — making it suited to big‑game bird hunting and demanding field loads.

Rugged Pump Action

Traditional Mossberg pump‑action design with features like dual extractors and twin action bars gives mechanical reliability and smooth cycling across shot lengths.

Interchangeable Chokes

The ACCU‑MAG system lets users swap choke tubes to influence shot spread based on load and target type, enhancing versatility in the field.

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Usage

The Mossberg 835 Ulti‑Mag was designed for hunters who want the flexibility to shoot a wide range of shells — from light field loads to heavy 3.5″ magnums — with robust performance and improved pattern density compared with standard 12 ga barrels. Its overbored design and interchangeability make it a versatile choice for multi‑season hunting.