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Thread: Scope mount on my SVU needs adjustment

  1. #1
    Happy Camper hcpookie's Avatar
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    Default Scope mount on my SVU needs adjustment

    I have found what I think is a good reload recipe, which is the recommended load for the 168 gr Nosler bullets I'm shooting. It is WAAAY more tame than the surplus stuff that was beating the crap out of me and my arm.


    Now I can have a problem. The POI is about 1 foot higher than the scope's highest click at 100 yards. This is a standard PSO scope. Bought it from Tantal way back when I was going to put this on my normal AK.

    The rail is roughly aligned to the bore but apparently not exactly. Removing the rail will be an extremely unpleasant and time consuming undertaking. The rivet installation was a bugger and I really don't want to do it again. Unless I have to.

    I wonder, therefore, if I could adjust this PSO scope by disassembling the bottom bracket and shaving part off the end, then loctiting it back together? The end result, I hope, would be the rail points it slightly more upward, since the rear "riser" would be slightly shorter, perhaps 1mm, than the front riser. The scope assembly seems like it is aluminum or some other lightweight metal, so it shouldn't be too hard to file the mating surfaces.

    Thoughts? Should I suck it up and redo the rivets? Or could I successfully file on the scope mount?
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  2. #2
    Happy Camper hcpookie's Avatar
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    ETA - the base mount is an "AK" style, not an "SVD" style mount. The square one. Each riser has two screws recessed into the risers that mount to the base.

    Upon further inspection, there appears to be an alignment pin on each of the risers. I'd have to remove those, then file the horizontal surface on the rear riser to raise the rear and make it point further upward.

    I am pretty sure that they secure this not with loctite, but rubber cement or perhaps hot glue. That certainly isn't a loctite kind of adhesive!
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    The "original" Boltcutter Rivet Squeezers:
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  3. #3
    Happy Camper hcpookie's Avatar
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    After talking to my dad, he explained what I need is normally referred to as "shim the scope ring" which looks like a better plan than filing some material.

    So instead of shaving the back down, I'll shim the front up a little. I just need to find some thin metal. I think something thinner than 22 gauge sheet metal. I have a set of feeler gauges that I may sacrifice. Now taht I think about it, perhaps cutting a coke can into strips would work too. Stay tuned...
    Gunco Member #10

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    The "original" Boltcutter Rivet Squeezers:
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    Project Pink - the Pink and Blue AK-74:
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  4. #4
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    I like the shim idea MUCH better!! let us know how it works. how much shim in the front results in how much drop in impact.
    I am off the page for extended times due to job requirements, not gone forever

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    tired of idiots vz58's Avatar
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    Try the coke can, its not that uncommon..

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    Happy Camper hcpookie's Avatar
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    The coke can works!

    I had to put 4 layers of the coke can to get it to hit near zero. I did not bother to try zeroing.

    The can I used was a Monster energy drink. It consistently measured .005" on my calipers.

    The 4 layers moved it approximately 4 feet, so I am guessing that 1 shim = approximately 1 foot @ 100 yards.

    This was for a PSO scope with an "AK-style" mount - the square kind.

    The scope was easy to disassemble, and the only hard part was the alignment pins that were punched into place after the screws were set. I had to use a punch to remove them, but after that it was real easy. Whatever glue that is that they use, it looks like hot melt rosin glue of some sort.
    Gunco Member #10

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    The "original" Boltcutter Rivet Squeezers:
    http://pookieweb.net/AK/rivet/boltcutters/boltcutter.htm


    Project Pink - the Pink and Blue AK-74:
    http://pookieweb.net/pink/pink.htm

  7. #7
    Gunco Maniac sjohnson's Avatar
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    Now that you've got it dialed in, may I suggest that you switch to steel shimming?

    Steel scope rings plus aluminum shims are dissimilar metals, half of the recipe for a battery. Add a little moisture and you could end up with corrosion from galvanic action.

  8. #8
    tired of idiots vz58's Avatar
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    "4 LAYERS!!?!??!" I have never seen anyone use 4..... what about milling down the base?? If you need someone to do it I will do it if you pay shipping.

  9. #9
    Gunco Veteran AKarl_12's Avatar
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    Be sure you don't tighten the scope mount too tight.
    You don't want to crush your scope tube.
    I always use layers of black ele. tape to shim my scopes.
    But I have never used that much shim???

  10. #10
    tired of idiots vz58's Avatar
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    Can you post a pic of your mount and rings?
    There has got to be a better way than 4 shims.

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