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My GP100 Project

This is a discussion on My GP100 Project within the Projects forums, part of the Firearm Forum category; I hope you guys appreciate this, I've already done this twice and wiped it out both times by inadvertently hitting the bottom of the screen ...


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Old January 27th, 2017, 09:53 PM   #1
 
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My GP100 Project

I hope you guys appreciate this, I've already done this twice and wiped it out both times by inadvertently hitting the bottom of the screen and "refreshing". Oh well they say the third times the charm....we'll see.

I recently bought a 6" GP100 stainless steel with the black rubber Hogue grips. It didn't take long for me to realize that my eyes and iron sights didn't really get along too good anymore. I was doing good to get 5 to 6 inch groups at 25 yards, from a rested position. Not too good! The first thing I did was drill the front sight blade and install a white Teflon insert to make the sight stand out better. Didn't have much effect on my groups.

The next thing I did was perform a home trigger job. This included some polishing and smoothing, lighter hammer and trigger return springs from Wilson Combat and hammer shims. The original trigger pull didn't feel too bad, but this made it noticeably lighter and smoother, however it didn't shrink my group sizes.

After that I replaced the grip with one that filled my hand better, some Hogue Pau Ferro wooden grips, and also because wood looks good! The finger grooves on these grips were uncomfortably close for me so I got out the dremel tool with a sanding drum and raised and widened the top groove behind the trigger guard. This eased the spacing between my middle and ring fingers and allowed me to get a higher grip on the gun. Some hand sanding to smooth and blend the new contours followed by several coats of low gloss tung oil gave me a grip that felt more comfortable in my hand.

Now for something to help shrink those groups. I had used tube type red dot sights on a Ruger Mk l years ago and thought this might help. I liked the looks and small size of the Burris FF3 plus it mostly had good reviews online. I'd seen where people had used the J Point mount with an adapter plate to put these on GP100's by replacing the rear sight. I ordered one and mounted it on my gun. With it in hand I wasn't happy with the look of it. It placed the FF3 higher above the bore than I liked and it looked a little "clunky" to me. I hadn't seen a mount you could buy that would mount it any lower, so being a machinist I decided to make one myself. I returned the J Point mount without even trying it at the range.

Using a piece of stainless steel and a lot of milling, drilling, filing and sanding I wound up with the lowest possible mount for a FF3 you can get on a GP100. By locating it on the frame ahead of the raised section for the rear sight it got it lower and the mounting plate is only 1/8" thick. That much is needed for the screws that attach the FF3 to the plate. And the bonus is it looks like it belongs on the gun. The recoil lug that sits in the space where the rear sight was matches the contours of the gun. The whole thing looks like it could have come from Ruger like that. Attaches to the rear sight screw hole. No drilling or tapping needed.

One last thing I did was remove material from the hammer to give it a faster lock time, to help make up for the lighter hammer spring. The stainless Ruger uses for these hammers is hard! Carbide tooling is definitely needed for cutting them. To reduce weight I cut a groove in the bottom of the hammer, cut a radiused slot above the pivot hole, notched the face of the hammer just below where it hits the transfer bar and thinned the hammer spur between the main body of the hammer and the checkered thumb tab. Finished it up with some filing, sanding and polishing.

Now for the results. Went to the range and set up at 25 yards. Fired a few shots to adjust the red dot, then loaded six rounds of some cheap Geco 158gr FMJ magnums. Cocked the hammer and fired. Hit about an inch high and a little right. Cocked and fired again...still only one hole in the target. Cocked and fired the third time....still just one hole! I was getting excited! Hated to fire the next three shots after that, wish I could say they went in the same hole too, but they spread out a little making a 1 1/2" group. Big improvement over iron sights for me! I'm posting a picture of that target as well as one I shot today 1 1/4" six shot group using the same ammo. Need to get my reloading outfit set up again so I can see what it does with custom loads.



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Old January 28th, 2017, 03:06 AM   #2
 
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Great job!!!
Looks like you're going to ruin a perfectly good styrofoam plate too.
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Old January 28th, 2017, 04:31 AM   #3
 
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Impressive! Any idea how much weight was taken out of the hammer? Have seen other people report this being effective too. The engineer in me is surprised that the reduction in inertia would be that noticeable but I am getting to be a believer.
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Old January 28th, 2017, 05:14 AM   #4
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That looks great! Thank you for making the effort to post this. I've got a list of modifications to do to my SP101, and the hammer lightening work is one of them.
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Old January 28th, 2017, 05:43 AM   #5
 
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That looks like a marketable mount to me.
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Old January 28th, 2017, 06:12 AM   #6
 
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Andy I didn't do any weighing on the hammer either before or after so I can't say for sure but I would guess at least a 20% reduction. As for the mount being marketable I'm sure it would but I used manual machining methods to make mine which takes far too long for me to consider doing it. With CNC machining it would certainly be feasible. Here is a picture of the lightened hammer.
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Old January 28th, 2017, 06:41 AM   #7
 
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The grips and mount look great. Very nice work. I'll be interested to see if the lighter hammer/ spring combo reliably pop all primer brands. You have made a great target gun sure to draw envious looks at the range.
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Old January 28th, 2017, 06:53 AM   #8
 
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Actually I had one light primer strike yesterday so I'll probably put the medium weight hammer spring back in.
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Old January 28th, 2017, 07:00 AM   #9
 
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I would really like to use this gun for some short range deer hunting next year. I bought some Double Tap ammo, 180gr WNGC hard cast that average 1350 fps out of my gun. I'd like to see what they can do on a deer. Or I might work up a load with 180gr XTP's.
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Old January 28th, 2017, 07:22 AM   #10
 
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Nice work. Thanks for sharing. I love my GP and part of the fun has been to tinker with it, making small improvements. I made my own hammer shims for both my GP and for my Security Six. Then I polished the sides of the hammer to remove the scrape marks that had formed their. Both works better and looks better.
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Old January 28th, 2017, 08:41 AM   #11
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Very nice! You could see if you can work out a deal with someone that has a CNC machine to make your mount.
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Old January 28th, 2017, 01:51 PM   #12
 
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Very nice install and write up, thank you.
I now have the info I wanted on the FF3.
You really made a custom mount that looks great on the GP100.
Yours does not look like a fat goose sitting on a log.
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Old January 28th, 2017, 06:33 PM   #13
 
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Wow. 25yds ? I'd be happy with that group at 5yds.
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Old January 28th, 2017, 10:33 PM   #14
 
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Thanks for the hammer photo. Might be fun to get a second gun for tinkering. Want to keep my first GP100 in OEM condition to see how it holds up.
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Old January 29th, 2017, 02:51 AM   #15
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Nice project and looks good. Thanks for sharing.
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