ProMag Steel Pistol MagazineBrowning Black Label 1911-380 .380 ACP 12-Round Black 12RD. 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 Browning Black Label 1911-380 .380 ACP 12-Round Pistol Magazine: Manufacturer: ProMag Gun Model: Browning 1911 .380 ACP Caliber: .380 ACP Magazine Capacity: 12 Round Features of ProMag Steel Browning Black Label 1911-380 .380 ACP 12-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 Browning Black Label 1911-380 .380 ACP 12-Round Pistol Magazine What firearm models does the manufacturer say ProMag Steel Browning Black Label 1911-380 .380 ACP 12-Round Pistol Magazine is compatible with? The manufacturer says that ProMag Steel Browning Black Label 1911-380 .380 ACP 12-Round Pistol Magazine is compatible with Browning 1911 .380 ACPProMag BRO-A11-12RD: Steel Pistol MagazineBrowning Black Label 1911-380 .380 ACP 12-Round Black