S&W 14402 MAG ASSY M&P40 20RD

The Smith & Wesson M&P40 20-round magazine is a reliable, full-size magazine designed to feed your M&P compact or full-frame pistol in .40 S&W. Whether you're at the range, in training, or carrying defensively, a quality factory magazine is foundational—it's where reliability begins. This OEM Smith & Wesson magazine gives you the confidence that comes with genuine manufacturer components, engineered to the same standards as your gun.

At 4 ounces, this 20-round M&P40 magazine strikes a practical balance: substantial capacity without excessive bulk or weight in your range bag, duty belt, or defensive carry setup. The 20-round configuration lets you run longer strings at the range and reload less frequently during practice or competition. If you're building a multi-magazine backup set for your M&P .40, or simply replacing a worn mag, factory magazines are the smart baseline choice.

Keep a spare or two on hand. Magazines are wear items, and having quality backups ensures your M&P .40 stays ready when you need it. This is the genuine Smith & Wesson part—no compromises on fit, feed, or durability.

Key Features

• Factory-original Smith & Wesson engineering for your M&P .40
• 20-round capacity for extended range sessions and training
• Full-size magazine profile for M&P compact and full-frame platforms
• Lightweight at 4 ounces—easy to carry and manage
• OEM reliability and fit assurance

Specifications

Frequently Asked Questions

Is this magazine compatible with my M&P .40 pistol?

Yes—this is a factory Smith & Wesson magazine designed for M&P pistols chambered in .40 S&W. It will fit both M&P compact and full-frame models.

How many rounds does this magazine hold?

This magazine holds 20 rounds of .40 S&W ammunition.

What comes in the box?

You receive one M&P40 20-round magazine assembly (part number 14402).

Should I buy multiple magazines?

Yes. Having 2–3 quality spare magazines is standard practice for any shooter—whether you're running drills at the range, training competitively, or carrying defensively. Magazines wear over time, so backups ensure your M&P .40 stays reliable and ready.