ProMag Pistol Magazine Sig Sauer Sig MPX 9mm Luger 50 Round Black 1 Pack DuPont Zytel Polymer 50RD. It is constructed of DuPont Zytel polymer with injection molded mag follower and stainless steel wire. Specifications for ProMag Sig Sauer Sig MPX 9mm Luger 50 Round Pistol Magazine: Manufacturer: ProMag Color: Black Fabric/Material: Polymer Magazine Capacity: 50 Round Caliber: 9mm Luger Gun Make: SIG Sauer Gun Model: SIG Sauer MPX Condition: New Package Contents: ProMag Sig Sauer Sig MPX 9mm Luger 50 Round Pistol Magazine What firearm models does the manufacturer say ProMag Sig Sauer Sig MPX 9mm Luger 50 Round Pistol Magazine is compatible with? The manufacturer suggests that ProMag Sig Sauer Sig MPX 9mm Luger 50 Round Pistol Magazine is compatible with SIG Sauer MPXProMag DRMA21-50RD: Pistol Magazine Sig Sauer Sig MPX 9mm Luger 50 Round Black 1 Pack DuPont Zytel Polymer