Since this is a pistol page I'll stick with them.
My favorite is the HW75 single stroke pneumatic. I have achieved 1moa accuracy with it shooting .25 cal plastic BB's with it at 25 yards, but that is pretty much all that it's for at only 400 fps with a .7 gr pellet.
In the same league are the HW40 or Beeman P17. or the Daisy 777, 747, series, from back in the eighties.
These are SSP pistols. One stroke of air.
A realy nice MSP I found is the Crossman H9A .22 cal. It is useless with its on board sights, but really accurate with an optic or dot, plus has some power to shoot with the small rifle targets, like Crazy Eights etc.
These are only available on the used market now, and I can't speak for the current offering?
I have a video of this H9A in action at 30 yards if you would be interested.
I have CO2's and springers that I have shot a lot of ammo through aswell.
Pistols are just fun, as long as they are accurate.