Odds and Ends for a CA M24

I'm just gonna cut to the chase. Here's my list of upgrades, and then some things wrong with it. What do all you M24/ Sniper fans suggest I do? (ie. Get this part instead, try this store, order overseas, etc etc)

-Prometheus 590mm 6.03 Tightbore Barrel
-PDI Palsonite Cylinder Kit with Vacuum Piston [This I'm getting last, once I can afford it...and if it doesn't shoot me too far over 550]
-PDI Silencer Adapter
-G&G SS-80 Silencer [I can't find the PDI Adapter anywhere, is there an adapter that I can use that will still ensure the silencer covers the length of the 590mm as well as I've seen?]

Yeah, pretty short and simple really.... I'm going for Range and Accuracy. I also would LOVE to find a 4-9x50 illuminated rangefinding mil-dot scope.

What other parts would you suggest? I have a feeling if I got the Cylinder kit I could put a Weaker spring in it if needed to lower the fps. I normally shoot .36s or .43s Thanks for the help, it's very much appreciated!!

Don't know about the other stuff, but the mil dot scope you can probably find on Airsoft GI.

This is the kind of reticle I want. The zoom is the least important...

Hmm. If you're specifically looking for that, I'd recommend looking at an actual hunting store. Either that, or just google it