- Designed and manufactured by Hatsan
- Easy drop-in upgrade
- Regulates discharge
- Produces more consistent shot-to-shot velocity
- Increases number of optimal shots
- Adjustable output pressure - factory set at 125 BAR (1800 PSI)
For AT44 series rifles, please be sure to verify whether or not the air cylinder's valve spring cover is threaded. The original AT44 series rifles used a white plastic plug, and require HA90420. Current production AT44 series and BullBoss rifles use a threaded spring cover and require HA90435. If you need assistance determining which item number fits your application, please contact our Service Department.
Click HERE for Installation Instructions