This is the ProMag Springfield Echelon 9mm 20-round extended magazine. 

Looking for an affordable and reliable extended magazine for your Springfield Echelon? If so, look no further!

The magazine’s heat-treated steel body features a black oxide finish, which together delivers superior corrosion resistance and durability. Internally, a chrome silicon wire spring and an injection-molded polymer follower keep the magazine feeding flawlessly. 

On top of it all, each magazine is made in the USA! Your Springfield Echelon can fill many different roles, so you might as well stock up on spare magazines!

Maximize your capacity and grab a couple of these extended magazines today!