This is not a good buy, the chamber really doesnt help all that much. i tested out both with and without and i didnt see much improvement in consistency at all. i Wouldnt suggest buying this upgrade unless you are looking to waste some money or like the look. i htink the only tim this will really help at all will be when you are shooting at a very fast rate of fire when your tank gets cold. but if you are using hpa it wont do anything at all!!!
not a good buy 
