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The Wilson Combat right-hand extension tube is a clean, straightforward way to boost your 870's magazine capacity by two rounds. Built from solid steel with a parkerized finish, this single-piece drop-in design doesn't need a reinforcing clamp or bracket, making installation fast and reliable on virtually any standard 870 variant.
Wilson Combat manufactures this extension from hardened steel, the same material philosophy that's made their components the go-to choice for serious users. The company has a proven track record with U.S. Secret Service and federal law enforcement who've relied on Wilson shotgun parts in the field. You get knurling on the base for tool-free installation and removal, plus the solid build quality you'd expect from a manufacturer with decades of precision work.
Wilson includes an extra-power magazine spring rated to push shell after shell forward with more authority than stock springs. The high-visibility follower (the plate that pushes shells) lets you see at a glance when the tube is empty, which matters more than you'd think in training or hard use. You also get a wave washer that helps secure the extension on barrels with magazine cap detents, and the base is dimpled to work with factory magazine cap designs.
Whether you run a standard M870, the 1100, or the 1187, this extension threads onto your magazine tube without hassle. Since it's a single-piece design with no external bracket, it will fit nonstandard magazine tubes that clamp-on extensions sometimes can't accommodate. The right-hand sling mount on the left side gives you a dedicated attachment point if you run a sling.
Yes. The Wilson Combat extension works on standard Remington 870, 1100, and 1187 shotguns. If your 870 has a standard magazine tube without a reinforcing clamp, installation is straightforward. Some newer 870 Express models have dimpled magazine tubes designed for capacity control; you'll need to deal with those dimples before installing the extension, typically with a swage tool.
The Wilson design is simple enough that most people can handle installation themselves. You'll unscrew the factory magazine cap, thread the extension on, and use the included wave washer or rely on factory dimples to keep it secure. The knurled base makes hand removal easy too. If your 870 has dimples you want to remove, you might want a gunsmith to handle that part safely.
Wilson's is a single-piece design with no bracket needed, making it simpler and faster to swap on or off. It comes with an extra-power spring that generates more pushing force than stock springs, which helps with reliable feeding, especially with heavier ammunition or after the tube has been used for a while. The knurled base and high-visibility follower add practical touches that matter in the field.
This two-round extension boosts your tube by exactly two shells. If you start with a standard 4-round magazine, you'll have 6 rounds total. Keep in mind that longer 3-inch shells might not all fit cleanly with this extension, especially certain premium or magnum loads. Most standard 2.75-inch loads and shorter 3-inch shells work without issue.
| UPC | 874218003425 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | SGETRH2 |
| Brand Fit | Remington |
| Caliber/Gauge | 12 Gauge |
| Capacity | 2 |
| Model | |
| Model Fit | 870,1100,1187 |
| Product Type | Magazine Extension |
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