Hi All...... after much reading here, it's become obvious that my .25 M4 is suffering from the classic "warm up" problem: first shot of the day is ~100fps low and it takes about a dozen shots to get up to the tuned 950fps.
So, I plan to strip the gun down and polish the valve rod, and replace the offending o-ring, but what material should I replace it with? I have FPM90 (Viton) and PU90 on their way in the post. The current exploded diagram on the FX site specifies FPM90, but is that the old spec or the new one that is supposed to prevent the warm-up problem?
Thanks in advance
Dunk
So, I plan to strip the gun down and polish the valve rod, and replace the offending o-ring, but what material should I replace it with? I have FPM90 (Viton) and PU90 on their way in the post. The current exploded diagram on the FX site specifies FPM90, but is that the old spec or the new one that is supposed to prevent the warm-up problem?
Thanks in advance
Dunk