Carlson's 04521 Magazine Extension 12 Gauge Remington 870/1100/11-87

The Carlson's 04521 Magazine Extension transforms standard Remington shotguns into higher-capacity platforms for competitive shooting, hunting, and tactical applications. This blued steel extension adds extra shell capacity to popular Remington 12-gauge models without compromising reliability or function.

What Makes This Different

Unlike universal extensions that require modification, the Carlson's 04521 features precise manufacturing tolerances specific to Remington shotgun dimensions. The blued steel construction matches factory finishes while providing superior durability compared to aluminum alternatives. Installation requires no permanent modifications to the firearm, maintaining resale value and allowing easy removal when needed.

Key Features

• Increases magazine capacity by 2 additional shells on most models
• Blued steel construction matches factory Remington finish
• Compatible with Remington 870, 1100, 11-87, Versa Max, and V3 shotguns
• No permanent modifications required for installation
• Includes extended magazine spring for reliable feeding
• Threaded design ensures secure attachment to magazine tube
• Factory-quality machining tolerances for precise fit

Competitive shooters benefit from reduced reload frequency during 3-gun matches and sporting clays events. Hunters gain additional capacity for waterfowl hunting where regulations permit extended magazines. The extension maintains the shotgun's balance point while adding minimal weight to the muzzle end. Weather-resistant blued finish withstands field conditions and regular use without corrosion concerns.

Technical Specs

• Gauge: 12 gauge only
• Material: Blued carbon steel construction
• Capacity: Adds 2 shells to standard magazine tube
• Compatibility: Remington 870, 1100, 11-87, Versa Max, V3
• Installation: Threaded attachment, no gunsmithing required
• Finish: Traditional blued steel to match factory appearance
• Includes: Extension tube and extended magazine spring
• Country of Origin: United States

The Carlson's 04521 delivers proven reliability backed by the company's reputation for precision shotgun accessories. Professional installation takes minutes, while the quality construction ensures years of dependable service across diverse shooting applications.