Turn the spring guide down and sleeve it rather than remove it altogether, go for a larger spring as Jon said so it is snug in the plastic piston liner and ensure that you get the correct metric O ring for optimum performance, I also fit a slightly larger ratchet dampening oring to reduce the cocking rattle. Most of mine have very little preload when reassembled and I find this works best. The early SA Jackals were coming out of the factory running well over power at one point.
The cocking slot and cocking lever can usually use a radius and polish.
This is exactly the same action as went in the Khamsin and SE90 so it is perfectly capable of full power smooth performance, while the 'flash suppressor' is iconic, a silencer transforms the performance.
Pellet choice is important, they usually do well on superdomes - these also feed nicely.
HTH
"But we have our own dream and our own task. We are with Europe, but not of it. We are linked, but not comprised. We are interested and associated, but not absorbed."
Winston Churchill 1930
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