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Recoil and Firing Pin Springs


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I apologize if this was discussed before -

I have purchased Wolff spring/guide rod paks for a friend with a glock 17C. He found the 20 LBS recoil spring to be the most convenient, but didn't replace the original factory firing pin spring. The gun wasn't as accurate as before(17LBS recoil spring factory standard). After replacing the original firing pin spring with the extra power firing spring that came with the 20LBS recoil spring, accuracy has been greatly imporved.

Can anyone explain to me why is that?



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  • 2 weeks later...

it can't be the inherent accuracy that changed (the bullet is out of the barrel before the slide compresses the spring), but it can be the practical accuracy (when trigger pull affected). Now, I don't know much about the Glock, does the recoil spring alone influence trigger pull????

And when you say accuracy, what exactly do you mean, i.e. how exactly was it measured (tell us sample size [how many shots], center of group movement, and standard deviation/group size)?

Just because 4 people agree on something doesn't mean it exists or is right...


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The recoil spring doesn't affect the trigger at all. The firing pin spring and trigger spring do though. I'd like to see the results from a benchrest with both firing pin springs, I'd imagine they'd have to be the same, unless I am completely missing something.

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Hi Guys,

4 guys tested the glock, 4 'experienced' guys(GIGN/SAS, IDF, gunsmith...etc'). I am not trying to brag but I to stress, that these guys have experience with small firearms(and big :) )

The dispersion/spread/scattering with the Wolff 20LBS Recoil spring and Glock original factory firing pin was much bigger than with the new Wolff firing spring. I wish I had pictures to show you. You know what? maybe I'll be able to test it again....

No one can explain this, not even Wolff! and the whole thing doesn't even sound logical! but it happenned...and there's nothing better than experience.

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Pulling the trigger on a Glock works against the recoil spring/slide.

With the Glock...the recoil spring is doing all the work of holding the slide and barrel in lock-up.

Pulling the trigger...pulls back on the striker tang...which is located in the slide....so, the force applied to the trigger to overcome the cocking/break of the striker is also the force that is working against the recoil spring (holding the gun in lock-up).

There is a slight chance that, with certain combinations of springs, there can be a bit of unlocking going on. Or, the strong recoil spring is putting the gun in lock-up better.

I wouldn't begin to say that this was a true factor. However, it is a possibility.

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