I spent a fun few months trying to get one to run correctly. I had no sucess.
I did all of the reccomended things, smooth this, polish that, new springs. No luck.
Even realizing the gum was made 20 years ago or so the quality of machine work, deburring, etc was rather poor
I became convinced it was a mag issue, messed with that a bit but short of making custom mags....
In the end I got rid of it. A gun has to be reliable, all else follows from there. In addition As a pocket gun it is too heavey, as a belt gun I would rather something with real sights and only slightly larger. Ditto for a briefcase gun.
I take everything with a grain of salt but there is a reason why AMT is frequently mentioned in negative terms.