[L473ncy]

This might be older knowledge that pertains to older generations of guns but I was always under the impression that a harder (or rather what's marketed as an "enhanced") hammer spring would be more "consistent" in hitting the knocker that hits the valve on the mag letting it open up for a similar amount of time each and every shot.

I've always heard that using duster gas without an upgraded hammer spring it's fine but once you introduce gasses under higher pressure (eg. Propane/Green/Top/Red gas) especially in the summer, that's when you need an enhanced hammer spring to keep it consistent.

Anyways, that's the extent of my knowledge on the subject of the hammer spring in a GBB.

PS: As for the upgraded recoil spring, it will make the slide return faster, AFAIK this raises gas efficiency slightly and is supposedly a "necessary" upgrade when you upgrade to metal slides.