I have some Ospreys in my collection, they are nice to handle, nice to look at, and the front heavy barrels combined with the pisol grip angle makes them good for offhand shooting... but..

The orignal piston rings, combined with the unguided spring make them quite horrible to fire, and most other guns i have of similar vintage are more accurate(HW35, BSA Meteor, Webley Victor)

One of my opsreys has gottem a bit of mechanical attention, with a tracker piston and a diana/gami type seal, A Maccari HW50 spring and delrin guides- a much improved gun, but slower than the Trackers with the same setup. Im currently planning to take the Ospreys and the Trackers apart this christmas, the Osprey transfer ports looks larger than the trackers, but measuring is needed.
Im also planning to convert an ospery to take the HW30 seal, hoping this will improve things further.

Wasnt the Osprey intended to be some sort of target gun back in the days? Were they better when the piston rings were fresh?