This is the ProMag Ruger-57 5.7x28mm 30-round extended magazine. 

Maximize your Ruger-57’s capacity with this 30-round steel magazine from ProMag!

Thanks to the heat-treated steel construction and black oxide finish, durability will never be a concern. Reliability won’t be an issue either, as you’ll find a chrome silicone wire spring and an anti-tilt polymer follower inside that keep every round feeding flawlessly. 

This magazine is also made right here in the USA, so what more could you ask for? Stock up for the range today!

Don’t forget to add a couple of these 30-round magazines to your cart before you check out!