http://www.airguns.net/reviews_daystate_harrier.php
you might find what your looking for here
Did you read that site before giving that “advice”
l. I removed the one hex bolt that keeps the action in the stock and quickly adjusted the power level to the maximum. At this setting, the Harrier shot the 10.5 Premiers around 925 fps. I adjusted the power level back down as low as the grub screws would allow before I started any formal testing. The power can be reduced further if so desired, but it requires a few internal adjustments. “
It doesn't say what screw or what to do to further reduce the power.
did you read the MIGHT part of the post
and I tried to help you with something I know nothing about and I see how many people showed up to help, just me
I went to the Day State owners site and signed up to find more info to help with your question and spent time to find anything else
and got mixed answers
I looked for a owners manual but only found one for the X model
so Matt the next time I see your name I will ignore it thank very much
Take the gun out of the stock, if it has a safety or a plug in the end cap, remove it.
cock the gun, flip it over, look at the hole right in front of the trigger block, use an Allen key to back that screw out about two rotations, then use a long Allen key in the hole that was covered by the end cap plug/safety, adjust as needed.
Don’t want to chrono it? Turn it so it’s all the way out, and it shoots loud, one turn will reduce it about 2Fpe in 22. Quieter is lower power in case you can’t figure that out.
When adjusted to the power you want, cock the gun, tighten that lock screw back. Put it back together.
