We also have band, breech, shoulder stock, you can find them from our store. Working pressure for valve is 25 mPa, for cylinder is up to 30 mPa. So DO NOT refill it up to 25 mPa. Best working pressure is 6~12 mPa with installed spring, if you want more powerful, have to change a harder spring(a harder spring will be included with longer than 1377 kit)
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