This is the Springfield Armory Echelon 9mm 50-round drum magazine by ProMag. 

Why settle for Springfield’s factory extended 20-round magazines when, with this drum magazine from ProMag, you can have 50 rounds at your disposal?

Constructed from a proprietary DuPont Zytel-based polymer, this magazine is ready for some serious range time. The heat-treated stainless steel magazine spring paired with the injection molded magazine follower keeps the magazine feeding smoothly through all 50 rounds.

From saving time at the range to increasing your home protection capabilities, these 50-round magazines will have you covered. On top of it all, they are made right here in the United States!

You can more than double your fun with these drum mags from ProMag, so add a few to your cart and let the good times roll!