Extend Your Loadout: 19 Best 12 Gauge Magazine Extensions

When you’re working with a 12-gauge shotgun, every round counts. But sometimes, your magazine can’t hold enough. That’s where a magazine extension comes in. These simple devices add capacity to your existing magazines, giving you more rounds without changing your gun. We’ve tested the best options on the market to help you find the right extension for your shooting needs.

As an Amazon Associate we earn through qualified purchases.

Reviews

Electryx 12 Gauge Heavy Duty Extension Cord

This heavy-duty extension cord pairs sleek yellow and blue design with tough protective jacketing that shrugs off harsh weather and wear. The 300-volt cable handles serious power loads while the built-in LED light keeps you safe by flagging any connection issues. Whether you’re working on a DIY project or powering tools outdoors, it’s a reliable partner that lives up to its five-star rating.

Iron Forge 12 Gauge 10 Foot Extension Cord

This trusty 10-foot extension cord combines reliable 12-gauge wiring with heavy-duty strain relief for consistent performance. The water and oil-resistant vinyl coating protects the inner conductors while the flame-retardant properties provide an extra layer of safety. With its 3-prong grounded plug and UL listing, it’s designed to meet rigorous electrical standards while staying discreet with its black finish.

Output 25 ft. Bulldog Extension Cord

This 25-foot extension cord combines durable yellow insulation with a reliable 12/3 gauge build, featuring a handy power indicator light. Built to handle extreme temperatures from -58° to 221°F (-50° to 105°C), it lives up to its toughness rating through excellent resistance to oil, moisture, and general wear and tear.

Lancer Shotgun Extension Tube for Benelli

With its sleek aluminum and carbon-fiber design, this shotgun extension tube adds three rounds to your magazine while keeping the extra length tucked neatly under your grip. The adjustable spring lets you fine-tune the fit, making it a practical upgrade for anyone who fires more than three shots in a row.

50 ft 12 Gauge Extension Cord

This heavy-duty extension cord packs impressive power-handling capabilities into a convenient 50-foot length. Made for serious use, it features reinforced connectors that resist bending and a tough SJTW rating for durability. Whether you’re powering tools on a jobsite or setting up shop in the garage, the cord’s triple-outlet design and built-in light indicators make it a practical choice that stands up to tough use.

Nordic +7 MXT Tube 12GA BK Needs Nut

These 12-gauge magazine extension tubes stack together with the right Nut (included with other purchase) to add a healthy seven rounds to your shotgun’s magazine. The clever design from Nordic Components means you can mix and match tubes to get the capacity you need, all while keeping individual pieces slim and easy to carry. Whether you’re bird hunting or just building up your reserve, these accessories do the job without complicated modifications.

10 ft Outdoor Power Extension Cord with Lighted End

This reliable extension cord handles 15 amps and 1875 watts, featuring a durable 12-gauge construction that prevents overheating. The brightly lit ends save you the frustration of searching for the plug in dark corners, while the weather-resistant design lets you use it indoors and out. Real users praise its ability to power heavy equipment without tripping breakers or getting too hot, though a few note the connectors could be even more robust.

Gogreen GG-14025 12/3 Outdoor Extension Cord

This durable extension cord combines heavy-duty 12-gauge wiring with moisture-resistant insulation for outdoor use. The contractor-grade connector system handles loads up to 20 amps, while the lighted green end provides an instant power indicator. At 25 feet long, it’s perfect for powering tools and equipment in garages or construction sites.

3ft 12/3 Outdoor Extension Cord with 3 Outlets

This robust extension cord combines durability with versatility for both indoor and outdoor use. The heavy-duty 12-gauge wire and thermoplastic construction handle everything from holiday lights to power tools, while the three-prong design provides reliable 15-amp power delivery up to 1875 watts. With its tough exterior resistant to moisture, extreme temperatures, and wear, this cord ensures your outdoor projects stay powered up without fail.

Tradesman 12 Gauge Extension Cord

Made right here in the US, this tough 50-foot cord is built to last. The bright yellow wire with its handy light-up plug makes it easy to spot in the grass or at the shed, and at half the price of similar cords, it’s a real bargain for any tradesperson or contractor. Whether you’re running tools or a generator, you get excellent value with this American-made cable that’s heavy-duty enough for serious use.

Watt’s Wire 12-Gauge Heavy Duty Extension Cord

Watt’s Wire has crafted a contractor-grade extension cord that combines durable 12-gauge wiring with practical features like a grounded design and 15-amp rating. At 25 feet long, it’s perfect for reaching those hard-to-access spots around your home or outdoor projects. The lighted SJTW version makes it easy to see where you’re plugging, giving you peace of mind when working in low light.

Warne CZ 75 9mm Magazine Extension

This magazine extension adds five rounds of 9mm capacity to your CZ 75, keeping your carry count legal while giving you that extra clip when you need it. The gray finish matches your firearm nicely, and it’s a simple way to carry a bit more insurance without the bulk of a spare magazine.

Kriss USA G48 Magazine Extension Kit

This lightweight, composite construction kit extends standard Glock magazines to hold 30 rounds instead of the factory limit. The precise mechanics of each piece - the extended baseplate, outer sleeve, and spring - work together to add capacity while maintaining reliable magazine function. The KRISS Mag-Ex Kit is specifically designed for full-size Glock magazines and the KRISS Vector, though it won’t work with the reduced-capacity 10-rounders.

12 Gauge Magazine Extension

These compact grip extensions slip over the existing magazine base plate, adding just enough length to make a big difference. The polymer pieces blend seamlessly with the firearm’s contours while providing the perfect amount of additional texture for a secure grip. Users with smaller hands or shorter grips will particularly appreciate the half-inch extension that keeps their pinky finger comfortably seated.

Shield Mag EXT +5/4 Glock Magazine Extension

This USA-made extension cleverly adds five rounds to a Glock 19 magazine and four rounds to a Glock 23, while its distinctive floor plate design lets you adjust the spring and follower without removing the extension. Made from durable 6061 aluminum and featuring type 2 anodizing, it’s compatible with original Glock 13 and 15 magazines, with universal compatibility for most aftermarket flared magazines.

12 Gauge Magazine Extension

Made from durable aluminum, this magazine extension adds five rounds to your Glock 17 while keeping the overall size under USPSA limits. At just 1.5 ounces, the weighted base makes it easy to swap magazines with lightning-fast draws. The included power spring and push-pin make it a straightforward upgrade for anyone who wants to carry more ammo.

ATI azine Bulldog A 5RD Black Shotgun Stock

Crafted from black polymer, these ATI magazines pack five 12-gauge shells into a reliable, no-frills package. The magazines work best with slightly modified bases to ensure proper fit with modern rail systems. While a few users experienced initial setup challenges, most report happy results once they made minor adjustments. The quality seems solid, and they’ve earned top ratings from many happy customers looking for basic yet functional 12-gauge magazines.

Heavy Duty 12-Gauge Power Cord

This heavy-duty extension cord packs impressive power delivery in a space-saving design. The double-jacketed cable handles up to 1875 watts with 12-gauge copper conductors minimizing voltage drop. At just over 10 feet, it delivers reliable 15-amp currents while featuring a built-in light for nighttime use and durable molded NEMA plugs.

50’ Weatherproof Outdoor Extension Cord

Rated for outdoor use and built to last, this 50-foot extension cord combines weather resistance with a handy power indicator light. The heavy-duty 12-gauge construction can handle circular saws and grinders, while the bright yellow jacket offers extra visibility and protection. Perfect for jobsite or backyard, where it can handle everything from power tools to outdoor lights.

Buyer’s Guide

When upgrading your 12-gauge shotgun, a reliable magazine extension can significantly enhance your capacity and efficiency on the shooting range or hunting trip. These accessories attach to your existing magazines, allowing you to carry more rounds while maintaining consistent magazine depth and reliability. Understanding key aspects of magazine extensions ensures you select a compatible and functional component for your firearm.

Compatibility and Firearms

Before selecting a magazine extension, verify compatibility with your specific firearm model and magazine type. Different shotguns and magazines have distinct dimensions, so ensure the extension matches your equipment. Pay particular attention to magazine length compatibility, as excessive extension can affect magazine catch mechanisms.

Material and Build Quality

Magazine extensions typically come in metal or high-strength polymer construction. Metal extensions offer superior durability and weight retention but may add noticeable mass to your magazines. Polymer extensions are lighter and more flexible but risk damage from repeated impacts. Consider the environmental conditions your firearm will encounter, as metal tends to perform better in extreme temperature ranges.

Manufacturing Standards

High-quality magazine extensions meet stringent manufacturing standards for tolerance and consistency. Look for components that maintain proper magazine alignment and prevent misfeeds. Premium extensions often feature precision-machined tolerances and durable anodized finishes to resist corrosion and wear.

Installation and Maintenance

Proper installation is crucial for reliable operation. Magazine extensions should sit flush with the magazine baseplate and align with the magazine release mechanism. Ensure all components are securely mounted and maintain consistent magazine height. Regularly inspect extensions for signs of wear, particularly at mounting points and contact surfaces. Clean and lubricate the extension as needed to maintain smooth operation.

FAQ

What is a 12 gauge magazine extension?

A 12 gauge magazine extension increases the capacity of your shotshell magazine by adding extra rounds. These extensions clip onto the magazine base, effectively lengthening it to hold more shells while maintaining proper magazine function.

Common capacities range from 3-round extensions for competition and economic models to 5-round extensions for extended magazine options. The extension clips securely into place without altering the magazine’s original design.

What are the benefits of using a 12 gauge magazine extension?

Magazine extensions enhance ammunition management by allowing you to carry more shells without extra bulk. This is particularly useful for extended magazines where an additional clip can double your available rounds.

They also improve shooting efficiency by reducing magazine changes during rapid-fire sequences, which can be crucial in competitive shooting events or fast-paced hunting scenarios.

How do I install a 12 gauge magazine extension?

Installation is simple: align the extension clip with the magazine’s base, then press down until it clicks into place. Ensure it’s seated properly to prevent jams during firing.

Most extensions click into place at the base of the magazine, but some models may have slight variations. Always refer to the manufacturer’s instructions for specific fitting details.

What materials are 12 gauge magazine extensions made from?

Magazine extensions are typically constructed from durable materials like stainless steel or aluminum. These materials resist corrosion and maintain dimensional stability under various environmental conditions.

Some manufacturers offer high-density polymer options for added grip and weight distribution, though metal clips provide the most reliable performance under load.

Are 12 gauge magazine extensions legal?

Legal status varies by jurisdiction, but 12 gauge magazine extensions are generally legal when used with standard shotshell magazines. Always check local laws and firearm regulations before purchasing or using magazine modifications.

In competitive shooting environments, particularly at the collegiate and Olympic levels, extending magazines may be restricted. Be aware of your specific competition’s rules regarding magazine modifications.

How long do 12 gauge magazine extensions last?

With regular use and proper maintenance, a well-made magazine extension should last for thousands of rounds without failure. Factors affecting longevity include material quality, maintenance practices, and frequency of use.

Regular inspection for signs of wear or damage is recommended. If you notice deformities, corrosion, or weakened clips, replace the extension to maintain optimal performance and safety.

As an Amazon Associate we earn through qualified purchases.