The Action Army AEG Cylinder has teflon coating that creates a smooth area for the piston to move back and forth. The port on the side allows the piston to compress the air properly so the BB can get pushed out all the way out of the barrel. This is an easy upgrade to most airsoft replicas for those seeking maximum air compression and efficiency. A "3/4" cylinder has venting ports 3/4 of the way down the cylinder for most efficient air compression in an airsoft replica with a barrel length of 270mm to 400mm
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