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AR15.COM
10/5/2014 1:22:01 PM EDT
I've gone through several periods of Glock ownership, currently I'm shooting M&P's, but might go back to Glock.

I understand they changed the guide rod on the Gen 4; can anyone give me any insight into why they did this?

I'll be shooting 9mm's BTW

Also, I did a basic search and didn't find any Guide Rod answers

Thank you
10/5/2014 1:33:06 PM EDT
[#1]
They use dual recoil springs on the Gen 4. That was to help tame the recoil of the 40 S&W.
Earlier Gen 4 9mm's had the same dual recoil springs which caused some reliability problems.
That has since been resolved by using lighter dual recoil springs for the 9mm Gen 4 guns.
10/5/2014 2:47:26 PM EDT
[#2]
OK, thanks
10/5/2014 3:08:45 PM EDT
[#3]
If you think you might have the wrong one, Glock keeps a list of the current numbers: