Originally Posted by GP100man
To decrease lock time.
If springs are kept stock, yep, you can decrease lock time. But, as mentioned in my earlier post, a lighter hammer also allows one to run lighter springs without increasing
lock time or
decreasing reliability. How
much lighter depends on a number of variables - how much mass was removed, where it was removed, smoothness of the action, etc.
A 3rd advantage is that a lighter hammer delivers a more powerful strike, but does so with less momentum - that's good because it's power
ignites primers, but momentum that jars the muzzle. Below is a demo of this very effect with my 686 with a radically bobbed hammer (BTW, this revo has a 7.5lb DA and lights off everything I feed it):