Originally Posted by RobF
but my rig seems to flick up now and then, and has been slowly growing in speed over the past couple of months, albeit by only a few fps.
Perhaps the barrel is running in.
I'm having a similar experience & the only thing I can think of is slight barrel wear.
I have put thousands of pellets(maybe as many as 10 thousand or very close) through mine & clean it regularly.
It could also be wear in the regulator or the firing valve is another thought.