Warne Magazine Extension for S&W M&P 9mm/.40 Black +5/+4

The Warne Magazine Extension is a drop-in accessory designed for S&W M&P magazines that increases usable capacity while maintaining a low-profile footprint. Machined from 6061-T6 aluminum and finished with a Type II hardcoat anodize in black, it is built for regular range use and practical carry scenarios. The extension adds capacity for both 9mm and .40 S&W magazines and features an ergonomic shape with finger grooves to aid insertion and removal. It installs without modification and preserves the magazine’s basic function and geometry.

Key Specifications

• Compatible with S&W M&P magazines (9mm and .40 S&W).
• Adds capacity of +5 rounds for 9mm and +4 rounds for .40 S&W.
• Constructed from 6061-T6 aluminum for strength and light weight.
• Finished with a Type II hardcoat anodized black surface for abrasion resistance.
• Designed with an ergonomic profile and finger grooves to aid magazine removal.
• Product type is a magazine extension intended for increased capacity.
• Color and finish listed as black hardcoat anodize.
• Installation is drop-in with no permanent modification required.

Compact and purpose-built, this Warne extension provides a straightforward way to increase magazine capacity while keeping handling predictable and reliable. Its machined aluminum construction and hardcoat finish deliver durable, understated performance for range use, training, and everyday carry setups that require a modest capacity increase without altering magazine ergonomics.