ProMag Glock 42 10 Round .380 ACP Pistol Magazine Black 1 Pack DuPont Zytel Polymer GLK 11-10RD. It is constructed of DuPont Zytel Polymer with full length steel internal insert injection molded mag follower and mag spring formed from chrome silicone wire. Specifications for ProMag Glock 42 .380 ACP Pistol Magazine: Manufacturer: ProMag Gun Make: Glock Gun Model: Glock 42 Caliber: .380 ACP Color: Black Fabric/Material: Polymer Package Contents: ProMag Glock 42 .380 ACP Pistol Magazine What firearm models does the manufacturer say ProMag Glock 42 .380 ACP Pistol Magazine is compatible with? The manufacturer suggests that ProMag Glock 42 .380 ACP Pistol Magazine is compatible with Glock 42ProMag GLK 11-10RD: Glock 42 10 Round .380 ACP Pistol Magazine Black 1 Pack DuPont Zytel Polymer