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Shooting Forum - Firearms licencing information


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scope lapping

  • 01-05-2014 5:56pm
    #1
    sniperman
    Registered Users, Registered Users 2 Posts: 2,035 ✭✭✭


    anyone know what lapping a scope is/means? and i dont mean a dog licking it:D


Comments

  • #2
    p.e.s.
    Closed Accounts Posts: 59 ✭✭p.e.s.


    It's lapping the rings. Not the scope. And it's to achieve 100 % contact between scope tube and the rings


  • #3
    bravestar
    Registered Users, Registered Users 2 Posts: 1,082 ✭✭✭bravestar


    You can also bed the rings, quite easy to do.


  • #4
    Cass
    Moderators, Sports Moderators Posts: 28,696 Mod ✭✭✭✭Cass


    When you put your scope into a set of rings sometimes the rings are not perfect. They may have imperfections that cause the rings to "squeeze" the scope in one place more so than the other and in other circumstances they may not be perfectly aligned on the rail/dovetail.

    Lapping the rings is done to remove these imperfections by grinding/sanding the rings (when attached to the rifle) to remove such imperfections. You can buy kits such as Wheelers that have both a lapping tool, compound and alignment set.

    First you place in the alignment tool/pieces. They can either be flat or point "bars". They should meet perfectly together (point to point). If they don't then chances are the rings need lapping. You remove the alignment tools and lap the rings. Place the alignments pieces back in and check. Do this a little at a time until you get perfect alignment.

    The end result is full contact between the rings and scope body, no squeezing or pinching of the scope and better alignment. Now sometimes it's not the rings at all. It could be the receiver/top of the action or the rail/dovetail the rings sit on. However as the rings are much more easily adjusted it is them that are lapped.

    The need for it is reduced depending on the quality of the rifle, rail, rings. However a small variation is not the end of the world. It is really only for badly mis-aligned rings that such a process would be needed.
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  • #5
    FISMA
    Closed Accounts Posts: 2,616 ✭✭✭FISMA


    sniperman wrote: »
    anyone know what lapping a scope is/means? and i dont mean a dog licking it:D

    I have lapped a few sets of rings. Indeed you will see high and low spots in the paint/finish.

    High end rings, like my Nightforce rings, specifically tell you not to lap the rings and if you do, the warranty is voided.

    Also, when you lap the rings, often there is often bare metal that if not lubricated, will rust.

    I still do it on some rings. It is more of a labor of love. I found the wheeler lapping bar to be a nice piece of kit, in addition to the FAT wrench.


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