What is the purpose of an extended firing pin
When you want a lighter DA trigger pull, decreasing the hammer spring weight is the main answer. There is a limit to how light the spring can be and still be able to fire the primer.
Adding an extended firing pin and a lighter FP spring, allows an even lighter hammer spring and can still fire the primers reliably.
Example" in a full size 75, the hammer spring is 20# stock. Changing to a 15# will likely still fire most primers reliably.
Changing to a 13# ( or maybe even less) hammer spring will still be reliable with an extended FP and lighter FP spring.
Hope this makes sense
