Quote Originally Posted by Ned Christiansen View Post
To give you a lighter trigger pull. Obviously you get a weaker hammer fall; maybe "less strong" would be better because I can't say misfires become chronic. But there's a whole sub-science where some high-end competitors will go lighter on the recoil spring and heavier on the mainspring to reduce forward-stroke movement while the heavier mainspring still modulates the back stroke. I have not really delved into this and not sure I'm sensitive enough to really notice the effect.
You call it 'forward-stroke movement' - I call it 'slide dip'.

The dip that the front of the gun takes when the slide returns home and things go back into battery.