The PTS version of the M12 Sidewinder has been specifically redesigned the internal components by increasing the strength and durability of the existing reinforced polymer internal parts. The Paddle Wheel’s “teeth” and the bb’s feed tube has been reinforced and restructured; this is optimized for use with the PTS EPM1 series such as EPM1 & EPM1-S. The o-ring-less nozzle reduces loading pressure and facilitates smoother feeding as usual.