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AR15.COM
10/19/2008 8:46:56 PM EDT
I just bought another Mk III and while the gun is in almost perfect condition, I think the previous owner installed a heavier hammer and recoil spring,  Just to be sure, I am going to replace both the hammer and recoil spring.  I shoot medium power reloads and nothing more 'cept an occasional full pwered defense round just for zeroing purposes.

Can anyone tell me what are the factory weights?  Thanks.
10/20/2008 6:18:35 PM EDT
[#1]
For a 9mm the factory main spring is 32lb. and the recoil spring is 16.5lb.