I have ballpoint pen springs on two of my Kadets and installed it for a friend/shooting partner as well along with modified chisel point on the FP. So far at least a few bricks of ammo through each of them with no problems. Probably more like a case through ones that shot the most. If it fails it s a not the end of the world. Replacement is cheap and changing is easy. I also have the original springs and extra new firing pins. Work reliably with 13lb main spring, but require cleaning (swab with a Q-tip) of the breech and bolt face (slide) more often. Every 500-800 rnds depending on the ammo. Doesn't like Aguila Super Extra SV(1-2% lite strikes) and CCL SV. Works great with SK Stnd+ and Norma TAC.
