SIG SAUER PMAG GEN 3 P556/MCX/SIG516 5.56 NATO 30 Rounds Rifle Magazine w/Window Black 30. 56x45 NATO (.223 Remington) polymer magazine for AR15/M4 compatible weapons that features transparent windows to allow rapid visual identification of approximate number of rounds remaining. Along with expanded feature set and compatibility the GEN M3 Window incorporates new material technology and manufacturing processes for enhanced strength durability and reliability to exceed rigorous military performance specifications. Specifications for SIG SAUER PMAG GEN 3 P556/MCX/SIG516 5.56 NATO 30 Rounds Rifle Magazine w/Window: Manufacturer: SIG SAUER Color: Black Fabric/Material: Stainless Steel Magazine Capacity: 30 Round Caliber: 5.56x45mm NATO Gun Make: SIG Sauer Gun Model: SIG Sauer P556 SIG Sauer SIG 516 SIG Sauer MCX Package Contents: SIG SAUER PMAG GEN 3 P556/MCX/SIG516 5.56 NATO 30 Rounds Rifle Magazine w/Window SIG SAUER Infinite Guarantee What firearm models does the manufacturer say SIG SAUER PMAG GEN 3 P556/MCX/SIG516 5.56 NATO 30 Rounds Rifle Magazine w/Window is compatible with? The manufacturer suggests that SIG SAUER PMAG GEN 3 P556/MCX/SIG516 5.56 NATO 30 Rounds Rifle Magazine w/Window is compatible with SIG Sauer MCX SIG Sauer SIG 516 SIG Sauer P556SIG SAUER 8900006: PMAG GEN 3 P556/MCX/SIG516 5.56 NATO 30 Rounds Rifle Magazine w/Window Black 30