This Teflon Coating Cylinder is just as durable and perform just as well
as other high end parts, but only cost a fraction of the price. This
cylinder is high polished with Teflon Coating to create a smooth surface
for uninterrupted airflow. This cylinder is ported and designed for the
M4 length barrel. The port allows the piston to accelerate before
compressing the air so the BB can accelerate all the way out of the
barrel.