ProMag Steel Pistol Magazine Ruger-57 5.7x28mm 20-Round Black 20RD. The springs are precision wound using heat-treated chrome silicon wire. Bases and followers are injection molded from polymers selected for their durability. The result is quality consistency durability and reliability. Specifications for ProMag Steel Ruger Ruger-57 5.7x28mm 20-Round Pistol Magazine: Manufacturer: ProMag Gun Model: Ruger-57 Caliber: 5.7x28mm Magazine Capacity: 20 Round Fabric/Material: Steel Features of ProMag Steel Ruger Ruger-57 5.7x28mm 20-Round Pistol Magazine Magazine body constructed of heat treated steel with black oxide finish Injection molded magazine follower Magazine spring formed from heat treated chrome silicone wire Package Contents: ProMag Steel Ruger Ruger-57 5.7x28mm 20-Round Pistol Magazine What firearm models does the manufacturer say ProMag Steel Ruger Ruger-57 5.7x28mm 20-Round Pistol Magazine is compatible with? The manufacturer suggests that ProMag Steel Ruger Ruger-57 5.7x28mm 20-Round Pistol Magazine is compatible with Ruger-57ProMag RUG-A42-20RD: Steel Pistol Magazine Ruger-57 5.7x28mm 20-Round Black
ProMag Polymer Pistol Magazine Glock 44 .22 LR 25-Round Black 25RD Original price was: $40.97.$32.49Current price is: $32.49. 
Smith & Wesson Smith & Wesson M&P 10mm 10 Rounds Pistol Magazine Black 10 Original price was: $62.50.$51.89Current price is: $51.89. ProMag Steel Pistol Magazine Ruger-57 5.7x28mm 20-Round Black 20RD
Original price was: $38.56.$32.89Current price is: $32.89.