Easiest-Most Difficult PCP's to Work On?

For those of you that do it, (work on PCP's your own or others), which ones do you consider "easy" or "hard" to work on, not necessarily tunning just sealing and replacing parts on different makes models ect. I've never had a need to do major surgery on a PCP myself, getting the parts and having the "special tools" would be my issue, just a matter of time I guess, in the auto repair business there were models, makes that would make me "cringe" and others that were a piece of cake, I would like to hear your opinions and experiences...thanks!
 
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Indeed ... LOGUN S-16's are a real bitch !! & sadly not that many around and obsolete. BSA R-10/ Scorpions one needs to understand the lay out and be careful.

RAW / Theoben / Marauder are some of the easiest to work on.



There are just toooooo many models and manufacturers to state where they fall in OP's question. As well what one wants to do changes the opinion greatly.



THO UNDERSTAND ... easy to work on or take apart is NOT directly linked with easy to modify, caliber changing, reg conversions, trigger tuning etc ....


 
While I'm not nearly as experienced as many in here I could add, as others already have, that the m-rods are really quite easy to work on. I recently picked up a Taipan veteran a year or so ago and wanted to dig into it a bit but was hesitant - one of the guys in here ( @Dairyboy I'm thinking? ) gave me confidence with his statement that "... if you can pull apart an m-rod and get it back together you can work on a Vet." (( or something to that general effect ))

He was spot on. :) The Vet is 'clunky' to work on - but it's not difficult. ( in my opinion )
 
BSAs are kinda tricky. More "Rube Goldberg" engineered than most others. 

The Air Arms S500 series is a very simple design. So much so that they hardly ever need anything. 

FX isn't too bad, but they used to use a bunch of cheap brass and tiny little wire parts. And the triggers were a joke with tiny little floppy pieces and a threaded hole through the trigger bar, with a bolt that passed through and also threaded into a wheel. Cheesiest setup I've ever seen. 

I like HW100s. Lots of leak points, but super easy to work on once you know how.