Hello everyone- Hope you will all forgive my ignorance with this question.  I have a Norinco underfolder (yes a "preban" gun that I can actually perform an infantry charge with that bayonete lug!!!) that keeps hanging up on ammo- right on the bullet guide with SERVEAL different mags.  It strikes me that a heavier recoil spring would probably fix the problem, but I don't know if "heavy duty" AK springs are made, who would make them, and what a "standard" weight AK spring is?  Any help here would be MUCH appreciated!!
Bluetick82520 (in Wyoming)