Gunsmithing and Tech Help
I've been trying to research this and I swear no one really knows. I want to get a heavier spring for my 2.0 M&P40 5". Everyone swears the guide rods and springs are all the same between the 1.0, 2.0, 4.25", and 5". I can clearly see the rod/spring are different between my 1.0 4.25" and 2.0 5"...