CZ-USA CZ Bren 2 Rifle Magazine 5.56x45mm NATO 30 Round Black Polymer 1 Pack. It features a window for round counting. Specifications for CZ-USA CZ Bren 2 5.56x45mm NATO 30 Round Black Polymer Rifle Magazine: Manufacturer: CZ-USA Color: Black Fabric/Material: Polymer Magazine Capacity: 30 Round Caliber: 5.56x45mm NATO Gun Make: CZ Package Contents: CZ-USA CZ Bren 2 5.56x45mm NATO 30 Round Black Polymer Rifle Magazine CZ-USA 11387-30RD: CZ Bren 2 Rifle Magazine 5.56x45mm NATO 30 Round Black Polymer 1 Pack