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This is a discussion on My GP100 Project within the Projects forums, part of the Firearm Forum category; Originally Posted by Rugerowner56 I hope you guys appreciate this, I've already done this twice and wiped it out both times by inadvertently hitting the ...


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Old January 30th, 2017, 06:10 PM   #16
 
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Quote:
Originally Posted by Rugerowner56 View Post
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.
First reply on the mobile app. Hope it isn't a bother.
You've done sort of the same thing I did on a 3" 38 special 1751. I am a toolmaker, too, but my employer distinctly frowns on "government work", so I used the Weigand short rail and Burris FF3. Not at all as low as yours, but sufficient for my needs. Now, if I owned my own Bridgeport mill, I'd strive to do what you did. That is some beautiful and elegantly functional work. Please do let everyone know how you fare next deer season. I'm betting you have a winner there.



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Old January 30th, 2017, 06:15 PM   #17
 
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that is a beautiful gun right there! hope to get one of these eventually
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Old January 30th, 2017, 06:24 PM   #18
 
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Accursed mobile view

Just like op, tried repeatedly to add photo of 3" GP100 for comparison sake. Hopefully works this time.
Attached Images
File Type: jpg IMG_0098.JPG (1.25 MB, 76 views)
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Old January 31st, 2017, 02:43 AM   #19
 
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Nice work there to the OP!!! Now a question or two, what are you doing for a holster??
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Old January 31st, 2017, 02:38 PM   #20
 
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Cbrigs that is a nice looking carry gun. I really like the grips. What kind of wood is that?

Gqucool I have a Bianchi holster that I used a die grinder to cut away leather until the gun would fit with the FF3 on it. I didn't like it hanging out unprotected so I took it to a guy that does shoe and leather repair to add a cover over it. It doesn't look great but it does cover and protect the sight while carrying. See pics below.
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Old February 14th, 2017, 07:04 AM   #21
 
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You made something Snake Plisskin would carry and made it sleek. Good work.
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Old February 14th, 2017, 07:37 AM   #22
needs more ammo
 
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Nice work all the way around, Rugerowner. Impressive.
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Old February 14th, 2017, 08:30 AM   #23
 
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Rugerowner 56, Not sure what wood. They're Jaruwan grips, bought used from another member here. I believe they are sold almost exclusively on eBay.
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Old February 14th, 2017, 09:47 AM   #24
 
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Looks like to me that the OP has now tuned up and made a very nice hunting & target shooting rig!!!
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Old February 23rd, 2017, 06:16 AM   #25
 
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Excellent work! Really nice when you have an idea, then have the tools to make it happen!

And I understand the "time" factor. Making for yourself, time doesn't matter, but for a marketable item it surely does.
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Old March 2nd, 2017, 01:41 PM   #26
 
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Impressive work you've done there. And you can't argue with those groups
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Old March 4th, 2017, 04:39 PM   #27
 
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I like both the 6" OP and the 3"!
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Old March 4th, 2017, 06:08 PM   #28
 
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Nice OP! Got me thinking of some new sights. Thanks for sharing.
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Old March 5th, 2017, 06:03 AM   #29
 
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Well Done !!
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Old April 7th, 2017, 07:41 AM   #30
 
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Damn nice setup!...sure would like one of those.
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