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    How to reduce AR15 recoil WITHOUT adjustable gas block or muzzle brake?

    I'm looking to build a Service Rifle AR15 for CMP EIC, and there are certain rules that must be adhered to. The big ones are: -5.56/.223 -Stoner gas impingement or piston, NO adjustable gas block -20" barrel max, no portion of the barrel may exceed 0.75" forward of the gas block -No muzzle...