I know your feeling I really think chops or jammed rnds have to do with the detents in the barrel.They are huge,mine are well broken in and miss feeds are gone.Magazine maint is inportant too.Here's some links to my t9.1 passage. A.C.E.S. - Conclusion & Review T9.1 A.C.E.S. - T9.1 learning curve
also try the tiberius arms forum lots of resorces there!!