Diana Diana 54 air king pro 7.5J

If looking to have a detuned 54 Airking. I would have a look for a 22mm piston kit and a weaker spring. The 12 fpe UK market 54’s use a restrictor washer in combination with the same spring I currently have in my rifle. .115 wire , rather than the .130 with in the FAC models. I believe the spring length is also shorter in both the factory detuned models 7.5 J and the 12fpe . I was able to disassemble without a spring compressor and it had about 1” of preload.
 
Got the rifle finished up while waiting for parts for another impulse buy. The new ARH spring got a delrin top hat made and I used the factory spring guide as it was about as close to a perfect fit as I would make myself. The steel washer with the factory guide was polished to a mirror finish, and burnished with some ARH moly. I also reused the factory piston seal , I didn’t see anything wrong with it although I found it to be a little tight before I sized it to my liking.
I mounted an Athlon 10 x 42 in the lowest rings I had available , still too high for a good cheek weld. A new lower set is in order. I just finished sighting in and tensioning the sled to where I found it to be most accurate. While also playing with the stock screw torque. At 35 yards shooting either the 10.3 or 8.4 JSB’s one ragged hole groups. I’m pretty happy with the way it shoots. The sled action is quite different to any other springer I’ve ever owned or shot. Once I put a ton of pellets through it I’ll see what I’m getting for velocity, I’m not chasing power on this one , just want a good solid performer with mild manners.
I did have to make quite the elevation adjustment on this scope . I’m thinking illl have to go with a droop mount to get it closer to optical center. Any suggestions on a good droop mount for a 30mm scope?