SDiK gas amount reduction.
Reduction will allow you to reduce amount of the gas. You will be albe to adapt amount of the gas to volume of the barrel. For barrels above 500mm you dont need reduction.
Installation may result in an increase in the amount of shots, improving accuracy and silence
Full lenght of the insert can reduce amount of the gas for 4500mm3 (standard is around 6500mm3). Reducer can be cut to the desired lenght.
Simplifying, to calculate the required volume change, you can use the following formula:
P - pressure in BAR
L - lenght of barrel in mm
Every 10mm of the reduction reduces the amount of gas for about 500mm3.