I have a Bantam Carry 9, I get that same malfunction with a particular ammo, Browning 124 fmj (it's really a trn).
I've only put 500 rounds through it so far and the only thing it has not malfunctioned with is 115gr rn. I've tried an assortment of 115, Fiochi, Rem G&W, Blazer. 147gr tends to...