This is the Smith & Wesson M&P9 9mm 50-round drum magazine by ProMag. 

Are you sick of having to reload your Smith & Wesson M&P9 so often at the range? If you are, then this 50-round drum magazine from ProMag will help extend the fun. 

This magazine is ready for some serious range time as it’s constructed from a proprietary DuPont Zytel-based polymer and features a heat-treated stainless steel magazine spring and an injection-molded polymer follower. These high-quality components keep the magazine feeding smoothly through all 50 rounds.

Whether you want to save time at the range or increase your home protection capabilities, these 50-round magazines will have you covered. Oh yeah, and they are made in the USA!

Add one or two of these drum magazines to your cart, and let the good times roll!