KNS Precision Czech Valve Gas Reduction Plug CZ BREN 2 7.62x39mm Black. They cover all models with the exception of the 8in 5.56. Specifications for KNS Precision Czech Valve Gas Reduction Plug: Manufacturer: KNS Precision Color: Black Handle Color: Black Finish: Black Features of KNS Precision Czech Valve Gas Reduction Plug Under normal operating conditions most Bren 2's are properly-gassed. The addition of a suppressors may cause the Bren 2 to become over-gassed Adjustable gas plug Does not fit 8in 5.56 Package Contents: KNS Precision Czech Valve Gas Reduction Plug KNS Precision KNS-CZ-V762: Czech Valve Gas Reduction Plug CZ BREN 2 7.62x39mm Black