HW77/97 tuning piston

Original HW77/97 piston by Weihrauch with 6 CNC-milled longitudinal slots for weight optimization. The original weight of approx. 260 g has been reduced to approx. 218 g. This corresponds to the weight of the previously installed 25 mm pistons.

The weight reduction leads to less recoil and thus improved shooting performance. Installation is easy, but the muzzle velocity (V0) must be checked afterwards. Due to its reduced weight, the tuning piston is only conditionally suitable for FAC +18 Joule, as it does not achieve full power here.

In the Basic version with the original Weihrauch piston seal.

The Premium I variant additionally includes a self-lubricating 26 mm piston seal and an inner piston sleeve made of stainless steel.

The Premium II variant includes a self-lubricating 20mm short stroke piston seal and an inner piston sleeve made of stainless steel. 

• significant weight reduction
• improves shooting performance
• replaces the Weihrauch standard piston
• easy installation/replacement

Scope of delivery:
Basic: Tuning Piston + Weihrauch Seal

Premium I: Tuning Piston + AirJoe Seal + Weihrauch Seal + Inner Sleeve

Premium II: Tuning Piston + short stroke Seal + Weihrauch Seal + Inner Sleeve