Warne Magazine Extension for S&W M&P 9mm and .40 S&W factory magazines

The Warne magazine extension (manufacturer part number 3314) adds extra rounds of capacity to a compatible S&W M&P 9mm and .40 S&W factory magazine. It is not a standalone magazine and does not include a complete magazine body.

Key Specifications

• This is a magazine extension accessory for a compatible factory magazine — it is not a standalone magazine and does not include a complete magazine body.
• Increases the round capacity of a compatible S&W M&P 9mm and .40 S&W factory magazine.
• Built for 9mm/.40 S&W-caliber magazines.
• Finished in gray aluminum.
• Manufactured by Warne.
• Always confirm compatibility with your magazine’s exact generation and model before ordering, since extension kits are generation-specific.
• Weighs about 0.11 lb shipped.
• Ships in retail packaging measuring about 1.2 by 3 inches.
• Installs in place of the factory base pad on a compatible magazine, no gunsmithing required.

Frequently Asked Questions

Does this include a complete magazine? No — this is an extension accessory only. It’s designed to increase the capacity of a compatible factory magazine you already own; it does not include a full magazine body.

What does this fit? It’s designed for S&W M&P 9mm and .40 S&W factory magazines. Always confirm your magazine’s exact generation and model before ordering, since extension kits are generation-specific.

Buy the Warne Magazine Extension for S&W M&P 9mm and .40 S&W factory magazines

Order the Warne Magazine Extension for S&W M&P 9mm and .40 S&W factory magazines from Warne, part of our magazine accessories selection, from a Lubbock, TX gun shop. Pick up a genuine capacity upgrade for your compatible magazine.