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GP100 Hammer modification

This is a discussion on GP100 Hammer modification within the Gunsmithing forums, part of the Firearm Forum category; Westphithy. Good job. I had to look at it twice to notice big difference....

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Old June 3rd, 2011, 04:45 AM   #91
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Westphithy. Good job. I had to look at it twice to notice big difference.

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Old November 9th, 2016, 01:16 PM   #92
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Hello. I am new to the forum here.

I realize this is an old thread, but I guess the subject is still interesting, at least for me.

I own a GP100 6" and I have installed lighter springs to lighten up the heavy DA trigger pull. Have polished everything, and also shimed trigger and hammer, so the hammer drops pretty good even with the lightest springs.
DA pull is nice with lighter springs, but my problem is that the rules in the competitions I shoot in demands a minimum trigger pull of 1360 grams. With lighter springs, the trigger pull in SA is below 1360 grams so the gun would not have passed inspection unless I swap to heavier springs.

I never use SA anyway, so I have bought a second hammer where I plan to grind of the SA notch to convert to DAO so that I do not have to worry about the trigger pull restrictions. With DAO, I would like to cut of the hammer spur so that no one would try to cock the hammer by mistake and risk letting of a shot unintentionally(since it would not lock back). Cutting off the hammer spur is not ideal since it reduces the critical mass, but by lightening the hammer like westphilthy have done and also in the yellow area marked by PaPaPork, wouldn't these mods kind of weigh up the negative effects from cutting off the spur?
I will also do my own reloads for the revolver and I will use the soft Federal primers, so I don't think I would have light strike issues even with lighter springs and a bobbeb hammer.. Any thougths?

I am no machinist/metallurgist/gunsmith, so I have no idea if possible at all, but several people in this thread claims to have access to machine shops.
If I had access to a machine shop, I would at least have tried to make my own hammer(cloning the factory hammer in lighter steel) rather than modifying the hard to work with factory hammer..
Has no one attempted this??

Last edited by The Edge; November 10th, 2016 at 01:07 PM.
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Old January 26th, 2017, 04:23 PM   #93
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I recently purchased a 6"GP100 and this is one of the modifications I wanted to do after changing the hammer and trigger springs and installing hammer shims. Being a machinist I have access to a milling machine and carbide end mills making cutting this hard stainless steel possible.

First I used a 3/16" end mill and plunge milled the radiused slot above the pivot hole, then using a 1/4" end mill I cut the notch in the face of the hammer just below where it hits the transfer bar. Finally I thinned the hammer spur just ahead of the checkered cocking tab, this makes the hammer look so much better. Then I finished it up with a polishing job.

Here are some pictures of the finished hammer.
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