It often goes so that simple = reliable.The gas ram Cometa 400 is an awesome rifle that anyone can take apart with no compressor ot tools.
I have more trouble free shots with it than any air rifle I have owned. It's inexpensive, shoots 740 fps in .22 and is easy to shoot. It's not as nice as an HW but it is (almost) as accurate. The trigger is good. The shot cycle is quick. They last a long time. I've shot mine 20,000 times since October and it's still shooting great.
That's twice as many shots as both my HW's combined. And I've had each of them rebuilt twice!
I've had it apart several times and there is simply no wear on the internals. The design is super simple. The piston is a piece of steel tubing with a seal on one end and a gas ram sticking out the other. You can rebuild it on the kitchen table using an 8mm wrench and a 5mm punch.
Ask any design engineer.
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