SIG SAUER 516/556 30 Round Magpul Pmag Gen 3 Window Pistol Magazine Black. 56mm Magazine Capacity: 30 Round Color: Black Package Contents: SIG SAUER 516/556 30 Round Magpul Pmag Gen 3 Window Pistol Magazine SIG SAUER Infinite Guarantee What firearm models does the manufacturer say SIG SAUER 516/556 30 Round Magpul Pmag Gen 3 Window Pistol Magazine is compatible with? The manufacturer says that SIG SAUER 516/556 30 Round Magpul Pmag Gen 3 Window Pistol Magazine is compatible with SIG Sauer SIG 516SIG SAUER 2401892-R: 516/556 30 Round Magpul Pmag Gen 3 Window Pistol Magazine Black