FX FX Impact M4 - Velocity consistency?
- By Xcaliber
- PCP Airguns
- 131 Replies
I'm surprised there is 61% as of writing this that are getting same speed. I own an fx impact (says in my name lol). I have use fx amp reg gen 3, also used huma reg, and then tired m4 reg with brass piston. All will creep about 5 bars over night and speed will be lower by about 40-50 fps using 33.9gr jsb heavy mk2. So I find it hard to believe that there is 61% getting same speed. Woozers. None of my other guns does this. I believe the fx impact have this issue due to the small reg. It's like 3 times smaller than any other regs on my other guns.
Based on what I've researched on this issue, the cold shot symptom goes way back to the M3 days, i read some owners decided to take apart their M3, thoroughly clean the valve rod when they found some grease on it and the o'rings, put them back together, and no longer see the discrepancy after overnight, same fps for cold shot, while few others only had the issue developed few months later, they did the same thing to take it apart for cleaning and lubing with silicone oil, but installed the "fix" made by mubhaur, which look like a plenum cap holding the valve rod, the "fix" also mitigated the issue.
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