This shorter model is the little brother to the R30 further reducing size and weight on the end of the muzzle. Due to its shorter size it moves the expanding gas through the suppressor faster offering great recoil reduction and reduced back pressure on semi-auto rifles. The gas flow is engineered to reduce flash recoil and sound. The Adjustable Port End Cap (APEC) feature allows tuning of external gas flow to help direct muzzle movement during recoil or maximize sound suppression.