Warne Mag Ext S&w M&p 9/40 +3/2 Blk
Warne
$34.99
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Warne
Warne Mag Ext S&w M&p 9/40 +3/2 Blk
The Warne Magazine Extension for the S&W M&P 9/40 is a precision-machined capacity and grip enhancement designed to give competitive shooters and self-defense carriers more rounds and better control in a durable, USA-made package.
- Adds +3 rounds for 9mm or +2 rounds for .40 S&W M&P magazines
- Machined from aircraft-grade 6061 T6 aluminum billet for lasting strength
- Type 2 hardcoat anodize finish resists abrasion, corrosion, and hard use
- Ergonomic finger grooves allow fast, reliable magazine stripping if needed
- Torx head screw and washer provide secure, rattle-free retention
- Designed and manufactured entirely in the USA
Who This Is For
This magazine extension is ideal for S&W M&P 9mm and .40 S&W owners who want to maximize round capacity for competition shooting, home defense, or range training. It's also a smart upgrade for anyone who finds factory magazine baseplates uncomfortable to grip or difficult to rip free under stress — the sculpted finger groove profile addresses both concerns in one compact accessory.
Specifications
| Brand | Warne |
|---|---|
| Compatible Firearm | S&W M&P 9mm / .40 S&W |
| Capacity Increase | +3 rounds (9mm) / +2 rounds (.40 S&W) |
| Material | 6061 T6 Aluminum Billet |
| Finish | Type 2 Hardcoat Anodize |
| Color | Black |
| Retention Hardware | Torx Head Screw & Washer |
| Country of Origin | USA |
| Series | Build-a-Mag |
Frequently Asked Questions
Will this extension fit both the full-size and compact S&W M&P models?
The Warne Mag Extension is designed specifically for the S&W M&P chambered in 9mm and .40 S&W. It is intended to work with standard M&P full-size magazines. Compatibility with M&P compact or Shield variants may vary — always verify your magazine's base configuration before installing any extension to ensure a proper fit and function.
Is this magazine extension legal to use in California?
California law restricts detachable magazines to a maximum of 10 rounds. Warne offers both capacity-increasing and zero-capacity (flush) versions of their magazine extensions to accommodate this law. If you are purchasing for use in California, confirm the resulting total magazine capacity does not exceed 10 rounds before installing the +3/+2 capacity model. When in doubt, consult local regulations or opt for a zero-capacity baseplate model.
Does installation require any special tools or modification to the magazine?
Installation is straightforward and requires only a Torx driver to secure the retention screw — no permanent modification to your magazine is needed. The extension replaces the factory baseplate and is held firmly in place by the included Torx head screw and washer. Most users can complete the installation in minutes with basic tools.
