I've been carrying a P12-45 for years, and it did jam for the first 200 rounds or so, and then just with the low-velocity bulk ammo. Since then, the only time I've ever had a problem has been after letting the mags get too dirty. If you carry a lot (like I do) and don't fire it as much, take it apart every now and then and give it a good cleaning. It's never jammed with the hotter loaded ammo, such as Cor-Bon, which I carry in it. It also loves the MagTech ammo, which is great because the stuff is cheap!