ProMag RUGA42 20rd 5.7x28mm Fits Ruger-57 Blued Steel
https://www.tandktactical.com/shop/708279015335-promag-ruga42-20rd-5-7x28mm-fits-ruger-57-blued-steel-46223
https://www.tandktactical.com/web/image/product.template/46223/image_1920?unique=c4d5331
Ruger Ruger-57 5.7x28mm (20) Rd - Blue Steel
