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Greetings,

I recently purchased a MKIII Hunter 6-7/8 Bull Barrel pistol and I am progressively modifying it for use in Bullseye Pistol competition. So far, I have accomplished the following modifications:

- removal of Loaded Chamber indicator
- Installation of a Volquartszen MK II Acurrizing kit (wow! what a difference!)
- Installation of Millett Series 100 competition sights (got rid of the Hi-Vis stock factory sight system)

I really like the sight picture presented by the new Millett sights. However, I experienced a problem with the rear sight in that I ran out of adjustment range trying to zero the pistol. The pistol shoots 1.5" high at 15yds with the rear sight elevation travel bottomed out.

Millet's solution to this is that they are sending me a slight lower rear blade for the rear sight. (its either that or a taller front sight).

Has anyone else experienced this issue on a MK III?

I shot my first Bullseye 900 leg match last night with the pistol and it worked wonderfully. I just compensated for the slightly high sight settings.

thanks,
erik

It happens sometimes when replacing factory sights with an aftermarket sight replacement. Ruger also will sell you the regular Mark III front sight base and you can get a notched rear blade replacement. Changing them out is a very simple matter

Until you get your replacement sight from Millett you can add a shim to raise up your front sight. According to my calculations you can add a .030" shim under your front sight base. That amount of shim will raise the front post up high enough to shoot at 15 yards with a little extra wiggle room for elevation adjustments to the front sight. Actually the exact measurement would be a .026" shim, but that would leave your front sight bottomed out with no elevation adjustment ability to compensate for other brands of ammo.

Cut the shim to the outer diameter of the front blade base and drill a hole through it where the hold down screw goes. Add a drop of Locktite to the screw hole and then tighten down the screw. The base will press the shim into the curve contour of the barrel when you tighten down the sight screw.

Hope this helps.

R,
Bullseye

Thanks. Millett ended up sending me a lower rear blade to swap out .312 vs. .375. That was nice of them to send it for free! They are not sure why my pistol shoots high, but I don't think they've have many people install this setup on a MKIII Hunter with 6-7/8" barrel.

I ended up machining a rear sight pusher tool for my Ruger MKIII rear sight. This enables me to easily (after field stripping) install or de-install a rear sight without having to resort to hammers, vises, or malletts.

Here are some pics. Click on a pic to bring up a larger version.



The parts break down. I machined the support block from 2024 1" plate (some leftover scrap I had)


The sleeve nut which goes inside the bolt area:


-erik

Good choice using the T-3. That 2024 aluminum stock has a high tensile strength, great durability for your sight pusher tool and the stresses of use. I like the design and the sleeve nut. Looks like you could make other sleeve nuts for applications on different receivers using the same basic pusher arm.

R,
Bullseye