Here it goes, this is a used pistol I purchased recently. It is a feinwerkbau 100. It underlever cocks and single loads pellets.
Caliber: 4.5mm
Power: seems pretty good, about 500 fps with lapua final match pellets.
Accuracy: Very good, by far the most accurate pistol I have ever shot, better than any other airgun I have shot, better than a s&w model 41, better than my .45's.
Trigger: Also very good, very adjustable. Can be adjusted forward and back, up and down, angle of the trigger shoe, trigger stop, and trigger weight. I can't figure out how to adjust the weight, or trigger stop, but everything else is easy. As it is now it is very light, with only a tiny bit of travel before it releases. Light enough that I can fire it without moving the sights at all.
Sights: Good, easy to adjust, the rear apeture can be made wider or narrower, comes with extra front inserts of various widths.
Cocking: pretty easy, you just have to make sure you push the lever all the way forward before pulling it back. It is nice that the loading gate and bolt are pulled back when you pump it.
Balance: I'm not sure, the barrel is so long that it seems tip heavy to me. I find that as long as I don't lift the pistol until I'm ready to fire it is alright. Maybe it is just me but if I take a long time aiming it is hard to keep it stable.
Noise: Super quiet.
Manual: Dreadful, very sparse for such a complicated pistol. The phrasing also makes it a bit unclear to me on a few points.
Other: Has the ability to dry fire which is nice.
The images:
A target I cherry picked out of a bunch, ten meters, ten shots, caliper is at 17mm.