So am I missing something, Rog? My understanding is the adjustment on the pot reduces/increases the volume on the pot, limiting/increasing air available (particularly at lower cylinder pressure) per shot, which has the effect of reducing peak power and flattening the power curve as volume is reduced...

Had to re-glue mine as it came unstuck of its own accord!

Have you considered buying "Bipod Sling Swivel Adapter Mount Stud With 1 Slot 20mm Weaver Picatinny Rail" ? Cheapest on Ebay is £3.32. Just screws on to the existing swivel stud.

Yes, but to adjust the volume of the pot (as I think the 57mm refers) you have to remove and re-glue?

How old is the gun? What is the shot count when the power falls below the level achieved at 190 bar? Is it down on power and giving more shots, or down on power and giving less shots than the AA spec? If the gun is down on power because the firing valve is releasing less air (for example the spring ...

Correct me if I'm wrong, but I think you'll find it's glued (Loctite) not screwed.

Sent you a PM

Hopefully you will find the Rhinos are fine. Just a word of caution, two piece mounts that close together can be a bit unstable so watch out for any shift in your zero. If you do have a problem try the one-piece mount.

Are you sure it was 7.0gr? it's not a weight I recognize - 7.90gr is common.
7.0gr at 995fps is 15.39ft lbs.
At the same energy 8.44gr will be 906fps.
In a springer, heavier pellets are normally a little less efficient so you are probably going to get a little under 900fps.

Examples:

https://www.ebay.co.uk/itm/UniqueFire-2 ... 2951415671

https://www.ebay.co.uk/itm/Snap-in-Rail ... 2611558672