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I have a FX Impact MK II STX 600mm .22 cal w/PP. I have an issue that has been driving me crazy and that's a short drive. I'm experiencing good groups at 50yrds for about the first 10 shots, then the group shifts to the right about 1". I'll continue to shoot another 10 to 15 shoots and the...

I have a FX Impact MK II STX 600 mm Power Plenum .22 cal with no mods. I started my tune of my Impact to shoot them around 990 FPS and played around with the valve flow control knob and could not get them to group at 50 yards. The 5 shot groups were not acceptable for target or hunting. I...

Hammer Spring Preload - .838” Power Wheel on MAX Regulator - ~80 BARs Valve Flow Control Knob - <3rd line or .318” 958 - 960 FPS This tune is producing good results at 50yrds 1/2” to 3/4”. I’m sure there are better tunes but this is working for me. Please share your tune for the JSB...

I have a FX Impact MK2 STX 600mm barrel w/PP, the rifle was bought new in April 2020. I have been shooting JSB 18.13gr but wanted to try some slugs with the STX barrel. After shooting the FX Hybrids, JBS Knockouts and Javelins I removed the barrel for easier cleaning. I used only a coated...