Easiest-Most Difficult PCP's to Work On?

Logun Sweet 16(S16) is far and away the poorest piece engineering and difficulty I've run into. Huben is reputed to be difficult, but I've no direct experience with it.

On the other end of the scale, the Steyr Lg100 is so simple and easy, I'm curious how they justify the cost.

Bob

While not a direct answer to your question (which one?),... anything that has been around awhile will have lot's of info. on the net with both word and video = easier. M-rod would come to mind. How good is customer support, manuals, diagrams, part availability? The better those are = easier. The less on all of the above = harder.

Both the Cricket Carbine and mini Carbine, and the EDgun R5 are about the easiest I’ve worked on. 
The FX Bobcat Mk1 is easily the worst. The way the gauge line is connected between the pressure tube and breech block is pure monster garage engineering...

Easiest for me would be a 2240 or Marauder. Crosman usually does good keeping it simple.

Easiest - Edgun. Mrod would be second 

Hardest - Sumatra. Verminator would be second 

I haven't owned or worked on many of the guns mentioned here, but in my experience, the easiest is the RAW and the most difficult is the FX Impact.

Easiest: RAW

Hardest:  

I would say a Mrod or Wildcat to be the easiest. Also a impact isn't hard at all to work on just lots of little orings which could be intimidating but straight to the point. 

Easiest Airforce. Easy pp700, Marauder pistol, RAW. And yes diagrams , pictures , organizing and marking parts groups really helps with re-assembly.

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 )

Lol yup I find the Taipans quite simple to work on. Also Edguns are a breeze also. Mrods are easy but a pita dealing with the gauge hole so I'd put the others as easier. Raw is pretty simple also

I just installed a power slug kit in my 2 month old FX Impact, having the advantage of unlimited air and YouTube made it easy.

Before that, I installed a Power Plenum kit on an older MkII.

The FX Impact is the tinkerer's wet dream!

My ATI Liberty. I can have it in just parts in just a half hour. 

Hardest has to be my Sumatra .25! Any airgun that needs a hammer to remove parts of the rifle is HARD!

Easiest and hardest all in one for me have been crosman. That is until you de burr everything. Many an oring have been sliced by the rough edges on the crosman tubes.

Easiest (without doubt), Crosman 1701P and 1720T.

Hardest (from my experience)- HW100.

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. 

Easiest would be the SPA pp800. Utterly the simplest design I've seen. Simpler than my crosmans.



Can't say I've had one that was terribly difficult.

HW100 for me. Easiest.