I agree with your comments that it would be nice to compare the three setups adjusted to at least work over the same pressure range.... The SSG was starting over 400 psi below the stock MRod string, and over 500 psi below the FFH.... A calculation of the total FPE of each shot string vs. the air used (ie the efficiency) would also be useful.... Otherwise, great test, thanks for putting in the effort, Joe....Bob
Fantastic, Joe. Big effort there, thank you for your diligence and for sharing with the GTA community. Yeah, the efficiency is the main attribute I am interested in between these two approaches so I want to look at your report more closely tonight but I gather from Bob's comment that we don't have enough information to calculate it. Hopefully you have the information though. I would have liked to see a comparison with the rifles producing the similar energy so as to more fairly evaluate efficiency, but there are multiple ways of bringing the tunes in line with one another and at least one of them would give an unfair result (transfer port restriction), so that would need to be thought out first.Thanks again!
One thing that appears to be missing on both devices is the ability to lock down the gap adjuster. Given no tension on it when not cocked, that adjustment can easily creep. Slight changes in gap, significantly change fps, in the experimentation I have done.It does have a nylon tip set screw that locks down gap adjuster and also you can change springs and tune it without taking gun apart. All metal parts and preload nut is stainless steel not Plastic!!