HAMMER SPRING STOCK (17 Lb.)

Bought this at the recommendation of an IFA person. GREAT SPRING! Possibly a little too good. It is a little heavier spring (14 lb original to a 17 lb) and maybe a slight bit too heavy! Along with the new firing pin (also from IFA) it can knock a whole in the primer of a round! No misfires yet (1 magazine of 14 rds fired through it) on fact, I shot 2 then rapid fired the rest with no issue. The pieces are working great and were quite affordable. Just a slight concern about how hard the firing pin is now striking....