If you are upgrading your MP5K / MP5K PDW or G3 SAS with a longer barrel, you will want to change the stock cylinder because the stock one was designed in such a way that just-enough compressed air is produced to get the bullets out of the short barrel. If you install a longer barrel, the amount of air held by the stock cylinder will become insufficient. The type of replacement cylinder to use depends on the length of the new barrel.
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