Noban -
I had a stainless Interarms PPK/S that wouldn't feed anything reliably. I also found it to be a nasty little gun to shoot -lotsa recoil for its size (blow-back design), hard to hold small butt in big hands, occasional slide bites. It was accurate, however, just wouldn't feed a full mag w/o a jam or misfeed. After three trips back to Interarms, still wasn't right, so I gave up and traded it off for a Beretta 85, no regrets. (Well, a little, it was a hndsome gun, stainless w/rosewood grips).
I have friends whose PPK/S's that have been nearly perfect. OTOH, I have a SIG 232 that feeds everything, has never jammed, feels great in hand and it quite accurate. Between it and the Beretta, I feel pretty well equiped, .380 wise. Good luck, M2