long story and I don't like typing, the gun never worked, and Joe could not handle a disgruntled buyer,, said he did not make descisions when upset, said he would call me back,,,, never did call back,,, the gun was a badly designed and poorly machined and assembled. I got hosed.
I got a second Sapsan in the S version from another member here, it has corrections that fixed the problems in the original sapsan,
most parts between the 2 different sapsan models do not interchange
many have good experience with him, mostly in the bottles and gauges ,,