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Replacing sights on a Springfield "fixed" rear sights with 10-8 sights.

Discussion in 'Tutorials' started by Quack, Aug 16, 2011.

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  1. Quack

    Quack it's mmm, mmm good... Staff Member Admin

    Aug 15, 2011
    Common question that I get asked is "How did you get the 10-8 sight to fit?" or "The 10-8 sight is too large for the Springfield dovetail." The 10-8 sight is a standard "Novak" cut sight, though Springfield's rear dovetail is about .015" small than the standard "Novak" cut. So in order to get the new sight to fit, some filing needs to be done on the new sight.

    I usually use a triangle file to do the filing, that way i can file all the way up to the tight corner of the sight. When you are filing remember that it's easier to take more metal off than it is to put metal on. Also remember it's better to make an error on the less expensive part, which is why the sight is filed and not the cut-out on the slide. When you are filing you want to maintain the same angle of the sight.

    In this photo you can see where the rear sights were filed from the factory. You can also see that on the sight on the left there is some remaining Loctite that the factory used. The sight on the left is from my EMP and the sight on the right is from my TRP.

    [​IMG]

    I file just enough so that the sight can start onto the dovetail about 1/3 of the way on, then i finish with a sight pusher. I've been using a B&J Machine P500 sight pusher for about 9 years now. One thing that I'm doing differently with it is I use the square pin in-between the round pin when installing sights. The reason is that the tips are worn and turn with the screw which could leave a mark on the new sight.

    [​IMG]

    I use a B&J Machine P500 sight tool that you can get from Brownell's
    P500 UNIVERSAL SIGHT TOOL

    I use a caliper to see that the sight is centered on the slide, which hasn't failed me yet. Once centered, I'll place a drop of blue Loctite on the set screw to keep it from loosening up. This is just an extra precaution even though I like to fit the sight really tight to the slide.

    Here's what the final product looks like:

    [​IMG]
     
  2. Quack

    Quack it's mmm, mmm good... Staff Member Admin

    Aug 15, 2011
    I swapped out the Heinie rear sight for a 10-8.

    Disclaimer: I'm not a professional, but this is how i do it

    With the sights side by side, you can see the size difference between the new 10-8 sight and the Heinie that was installed on the STI Tactical.
    [​IMG]

    You can see where the Heinie was filed by the factory.
    [​IMG]

    The Heinie that I removed:
    [​IMG]

    The new 10-8:
    [​IMG]

    Using a triangle file, I filed the rear part of the dovetail down to size. Take your time when filing because you can always take more off if needed.
    [​IMG]

    [​IMG]

    Once the sight dovetails were the same size, i broke the edges of the lower corners of the dovetail, just like the factory did.
    [​IMG]

    I didn't take a picture, but i used Brownell's Formula 44/40 cold blue to coat the areas that I filed.

    I fit the sights so that they start about 1/3 of the way before I use my sight pusher and put a drop of blue Loctite on the dovetail as an extra measure so that the sight won't come loose.

    Here's the end result:
    [​IMG]
     

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