as with any mk1/mk2, they also benefit from throwing the piston weight away and replacing with delrin, along with an appropriately longer spring. less recoil and a fast action, but with very marginally increased cocking effort over factory spec.
ensure the large rear allen bolt that sets the sledge is unwound far enough (small adjustments), as it might be that caused the prevuious owner to apply excessive force at the end of the stroke, breaking the link.
Always looking for any cheap, interesting, knackered "project" guns. Thanks, JB.