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The Warne magazine extension (Model 3306) solves one of the most practical issues M&P owners face: needing just a few more rounds on tap. This aluminum extension bolts onto your factory magazine base, adding three rounds to 9mm magazines and two to .40 S&W magazines, while maintaining that factory look and feel.
Machined from 6061-T6 aluminum and finished with a Type II hardcoat anodize in black, this extension can handle range sessions and regular carry use without showing wear. The black finish resists corrosion and scratches better than bare aluminum. Installation is straightforward with a Torx head screw and washer that you tighten down. Once secured, it's not going anywhere.
The extension features finger grooves that give you something to grip when inserting or removing the magazine from your gun, which is especially helpful during fast reloads under pressure. The profile blends naturally with your existing magazine grip without adding bulk. Your hand doesn't need to relearn anything. The added length simply gives you more purchase on the magazine without changing the handling characteristics of your M&P.
This extension is designed specifically for Smith & Wesson M&P 9mm and .40 factory magazines. It requires your factory magazine as a base and does not ship with a magazine included. Once installed, it integrates seamlessly with your existing magazines without modification to your gun or requiring any special tools beyond what comes in the package.
No. This extension attaches to your factory Smith & Wesson M&P magazine base. You'll install it by removing your factory base plate, sliding the extension on, and securing it with the included Torx screw. The magazine itself is not included.
No. This Warne 3306 is designed for full-size S&W M&P 9mm and .40 S&W models only. The Shield uses different magazine dimensions and requires a different extension.
The extension maintains the magazine's internal dimensions and geometry. Factory springs and followers work as intended. The added grip surface and finger grooves improve handling during reloads without compromising function or reliability.
The extension adds length to your magazine, which may not fit in pouches or holsters designed for standard-capacity factory magazines. You'll want to test fit before relying on existing gear in daily carry or duty situations.
| UPC | 656813108084 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 3306 |
| Caliber/Gauge | 9mm |
| Capacity | 2 |
| Color | Black |
| Model | |
| Product Type | Magazine Extension |
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