All I can say is with my limited experience with this rifle, there is no logical reason at all why they need to be under powered. They have a fair size compression chamber and the spring is similar in size to a Titan 003. This one needed the power dropped by 3 ft. lb. The only reason I can see them putting out low power is the piston seal material. It seems to be a type of harder PTFE, which can be fine at the early life of the rifle, but is malleable and can also reduce in diameter much quicker than polyurethane. Because this rifle has hardly been used it still has a good fit between piston and chamber. As to owning one, the reasons would be for a collection or nostalgia. My HW95 is just as accurate, much smoother in operation, and feels better balanced, so I would prefer that as an actual shooter.
Baz
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BE AN INDEPENDENT THINKER, DON'T FOLLOW THE CROWD