Carlson’s 7-Round Magazine Extension — Benelli M4 12 Gauge

The Carlson's 7-round magazine extension is designed for the Benelli M4 12 Gauge and replaces the factory magazine cap to increase magazine capacity. Constructed of blued solid steel, it is supplied with a spring and a base clamp fitted with a swivel stud. A high-visibility follower is included with some units; other units require the factory follower.

Key Specifications

• Compatible with the Benelli M4 shotgun.
• Caliber/Gauge: 12 Gauge.
• Magazine capacity is 7 rounds.
• Material and finish are blued steel.
• Includes a spring and base clamp with swivel stud as supplied.
• The extension replaces the factory magazine cap via a threaded tube to add capacity.
• Works with a quick detachable swivel; the swivel is not included.
• High-visibility follower availability is model-dependent; some units require the factory follower.
• Listed weight: 0.4188 (supplier listing).

Built for straightforward durability and reliable function, this Carlson's magazine extension provides a practical aftermarket option to increase magazine capacity while maintaining a clean, serviceable profile. Its blued-steel construction and direct compatibility with the Benelli M4 make it appropriate for competition, duty, or general-purpose use where dependable components are preferred.