1911 Mainspring

[soditide]

Hi . I would like to known if i'm obligate to change the firing pin spring and the recoil spring if i put a 15 lbs or a 17 lbs mainspring.

 

[45ACPKING]

Hi . I would like to known if i'm obligate to change the firing pin spring and the recoil spring if i put a 15 lbs or a 17 lbs mainspring.

not the recoil spring but you might want to match the mainspring to the firing pin spring
A heavier mainspring affects force of the hammer fall on the firing pin

 

[soditide]

But if i put a lighter mainspring, the slide will cycle faster. With a lighter mainspring The slide have less resistance during the cycling No?? I tought that i have to change factory recoil spring ( 16 lbs ) for a heavier recoil spring ( 18 lbs ). Correct me if i'm wrong.

What you recommand for the firing pin spring in term of weight if i decide to put a 15 lbs mainspring?

 

[easy]

When you purchase recoil springs from Wolff Gunsprings, they include an extra power firing pin spring regardless of the recoil spring weight. They do so because when you replace the recoil spring, you should also replace the firing pin spring to maintain reliability.
Not so much the mainspring, but might as well replace that at the same time too. 1911s are all about timing. Much of it revolves around the type of ammo you use in your gun.