I definitely recommend the MASK and the cylinder head with the Sorbo dampener on it, It gives the gun a very nice quiet sound. I have used them in everyone of the guns that I've worked on and have had no complaints they make the gun sound wonderful. The systema silent head setup doesnt actually silent the gearbox much.
I've run easily a 420fps spring with a high ROF in my JG gearbox with the mask n sorbo combination. Its been almost 3 seasons now and no sign of wear or tear to the gearbox.
I havent seen a drop in FPS on any of the 12 guns I've installed sorbo's onto
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