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Shooting an 18″ 6.8SPC barrel with the OPSINC 4-port muzzle brake has slightly more recoil impulse than a 18″ 5.56mm with no brake. It is more noticeable than 5.56 recoil in rapid fire (e.g. double tap, hammer) and full-auto, but much more controllable than 308 weapons with comparable rates of fire.
