- FAC (HP High Power) performance tuning main spring for Hatsan air rifles: Striker, Airtact, Zada, and Edge, compatible with 4.5 mm (.177), 5.5 mm (.22), and 6.35 mm (.25) calibers.

FAC (HP High Power) performance main spring designed for both break-barrel and underlever air rifles by Hatsan Arms. Specifically engineered for models in the Striker, Airtact, Zada, and Edge series, compatible with calibers: .177 (4.5 mm), .22 (5.5 mm), and .25 (6.35 mm).
This steel spring restores the air rifle’s maximum power output (FAC), as specified by the manufacturer for the High Power version of each model and caliber. Recommended for enthusiasts who enjoy custom tuning and enhanced shooting performance.
Manufacturer: Hatsan, Turkey
Developed by: Sharg®, the exclusive importer of Hatsan