ProMag Drum Magazine Features The ProMag Drum Magazine is molded from durable black polymer giving it the strength to withstand repeated loading unloading and drops at the range without cracking or warping. Its drum-style housing holds 50 rounds of .40 S&W dramatically extending the shooter s capacity beyond a standard factory magazine. This design lets shooters spend more time firing and less time reloading during range sessions or competitive stages. The polymer construction also resists corrosion keeping the magazine functioning reliably even after extended storage. Built specifically to fit the S&W M&P 40 this drum magazine is a direct fit that requires no modification to the firearm. ProMag has long produced aftermarket magazines for a wide range of popular handguns and this drum extends that lineup to shooters who want significantly more rounds on tap. The compact drum profile keeps the magazine easier to carry and store than an equivalent-capacity stick magazine would be. For M&P 40 owners looking to add high-capacity training or competition options this ProMag drum is a straightforward way to do it. Pro Mag Industries Drum Magazine for S&W M&P 40 Specifications Brand: ProMag Type: Drum Magazine Caliber: .40 SW Compatible Hosts: S&W M&P 40 Capacity: 50 Rounds Material: Polymer Color: Black Available At: GrabAGun