Umarex T4E Universal Quick Piercing Bottom Cap Screw Assembly - Gen 2 Mechanical Markers With the Keystone you will

With the Keystone you will get easy turnovers and straight flights even at low speeds

Air Valve O-Ring (large)

This gun literally shoots “laser beams” of paint

Improved Moisture Resistance: While the Clock III is not designed to be waterproof

while APS recommends the use of their CO2 adapter

Umarex T4E Universal Quick Piercing Bottom Cap Screw Assembly - Gen 2 Mechanical Markers With the Keystone you willThis is the newest, upgraded version. It can be used as a replacement for newer models that come with this one already, and it can also be used to upgrade older models. This works with all current and previous T4E markers that use the lower grip CO2 piercing cap. This new Gen 2 cap features a quarter turn pressure release mechanism as well as a better grip profile, making it easier to use. Fits the following models: T4E TR50 T4E TR50L T4E HDR50 T4E