Action Army VSR-10 Piston - 45 Degree Air Nozzles which is the most common

which is the most common

The Ultimate Sighting System (USS) Gen II gives you all the Benefits of a Mark III Tactical 3-9X magnified Scope with the Advantage of a Micro Red Dot Reflex Optic for close range targets

Shoots 330-340 fps w/

This size is commonly found in red dot sights

Action Army VSR-10 Piston - 45 Degree Air Nozzles which is the most commonAction Army VSR 10 Reinforced Piston. Fits Tokyo Marui VSR 10 sniper rifles, clone guns, JG BAR 10, etc. This is the original style 45 degree piston, which is made for stock guns, triggers, etc. A great upgraded piston that will handle a lot. If you plan on using the Zero trigger, you will need the 90 degree piston instead of this one.