Features:

• While the stock piston only uses one o-ring to guide it, the Shocktech piston uses two.  Having the extra o-ring provides a better seal making it less likely to leak.
• Piston is held in its' position inside the gun by the o-rings.  Having two points of contact keeps the piston from wobbling or moving off-center inside the gun.
• Quick and easy install. Less than 5 minutes