I am looking for a builder to put the left hand cocking tube on my zenith z5p. I just heard back from parabellum combat and was told he does not work on the zenith and was under the impression from previous conversations that they could. So now I am looking for a new builder that can do this for me or at least some help to do it myself. Would hate to have to sell this gun as my wife has already stolen my CZ Scorpion Evo.