Our Rosco Non-Adjustable Gas Blocks are purposely designed to be lined up perfectly with our barrels and gas ports to ensure reliable cycling every time. Our Non-Adjustable gas block is a direct plug in for any one of our barrels and has provisions for pinning. Each Gas Block comes with (2) set screws and (2) roll pins.Rosco Manufacturing's "Bloodline" series is our hardest working category. Whether you are an occasional builder, tactical shooter, or Law Enforcement Officer we have a product that will fit your needs. All our Bloodline accessories are designed to take the abuse from unconventional wear and tear that our customer may need to inflict on their platforms. This is the only way that we can make sure that we are producing a product that will perform time after time under the most austere of conditions. We are setting out to re-define the rules and we plan on letting our work do the talking...