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AR15.COM
3/6/2011 12:27:36 PM EDT
Hey guys, I've mixed up my springs.  I normally shoot a 12 pound Wilson Combat recoil spring, instead of the stock 16 pound spring from Springfield.  I've now got them mixed up and can't tell the difference.  

There is a 1/4 inch difference in length, but the # of coils/inch is different too.  

Can someone with a #12 Wilson Combat recoil spring measure it and let me know the length?  Thanks guys.
3/6/2011 1:29:23 PM EDT
[#1]
Couldn't you just install each of them and see which one is lighter?
3/6/2011 1:39:32 PM EDT
[#2]
Quoted:
Couldn't you just install each of them and see which one is lighter?


This
3/6/2011 4:30:07 PM EDT
[#3]
After a recoil spring has been installed in a pistol for a while it will compress somewhat and shorten. 12 lb is for reduced power loads like 200 gr semi wad cutters for bullseye competition and 16 lb for regular loads. You should be able to tell the difference by installing each spring and slowly pulling the slide back.
3/7/2011 12:23:51 AM EDT
[#4]
I thought that the factory springs were 18.5 lbs or something?
3/7/2011 2:46:57 AM EDT
[#5]
Measure the thickness of the springs...that's the difference in springs.  Thicker the spring....the heavier poundage.  I have them written down in my loading book.....but if you're dealing with only two springs...the thinner one will be the lighter one.
3/7/2011 7:54:47 AM EDT
[#6]
Or weigh each one on a powder scale - the lighter will be the 12 lb.

3/7/2011 8:52:20 AM EDT
[#7]
Quoted:
I thought that the factory springs were 18.5 lbs or something?


Factory spec is 16lbs.  Most gunsmiths recommend an 18.5lb spring.

You should only be running a 12lb spring with a gun with a compensator or only with reduced power loads.  In a stock gun with factory spec ammo you're going to be battering your slide and frame with factory spec ammunition using a 12lb spring.
3/7/2011 9:48:14 AM EDT
[#8]
For $7.95 you can buy one and put your mind to rest.

What loads are you running out of that very soft spring?