Warne Magazine Extension for S&W M&P 9mm/40 S&W – +3/+2 Capacity

The Warne Magazine Extension adds 3 rounds to standard M&P 9mm magazines or 2 rounds to M&P 40 S&W magazines, giving you extra capacity without switching to a longer magazine body. Designed for shooters who want more rounds on tap for competition, range training, or home defense, this extension maintains the magazine's reliability while increasing firepower.

Machined from aluminum with a black anodized finish, the Warne extension installs directly onto factory S&W M&P magazines. The baseplate replaces the factory floorplate and uses the original magazine spring, though Warne includes a higher-tension spring for optimal feeding with the added capacity. Installation requires disassembly of the magazine but does not require gunsmithing or permanent modification. The extension adds minimal length to the grip, preserving the M&P's handling characteristics.

• Part Type: Magazine Extension Baseplate
• Compatible Firearms: Smith & Wesson M&P 9mm (+3 rounds), M&P 40 S&W (+2 rounds)
• Material: Aluminum
• Finish: Black Anodized
• Installation: Drop-In (magazine disassembly required)
• Includes: Extension baseplate, replacement magazine spring