I dunno. Carried a revolver for a year in Nam, never jammed, never got cleaned. Carried a 1911 during tour #2 and it never jammed either.
A few years after I left the service I purchased a S&W Model 59. Jamm-o-matic it was. Revolvers never let me down, nor has my little Ruger LCP. I think that stands for Little Chitty Pistol, but it fits in the pocket OK-fine.