Hello, I just got a Marlin 989m2 from my grandfather. I did a little thread reading and decided I should change out the springs with the J&P spring kit. My question is, when people say to go ahead and replace the buffer, is that the same part as the recoil spring guide? Also, the firing pin looks to be a little short or worn down. I could only find it at Numrich but it was sold out. I need the old style firing pin, everyone seems to have the new style. Any suggegstions where I can get one? Thanks in advance.