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What Size Is The Average Scope Arrestor Pin?

Discussion in 'Technical' started by pjgtech, Oct 8, 2019.

  1. pjgtech

    pjgtech If the Enemy is in range, so are You!

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    Hi, just got a couple of one piece scope mounts, which I want to add to a couple of my springers, but they don't have scope arrestor pins, (they do have the hole, just no pins).

    Are these all the same size or a standard size, or does it depend on the scope make?

    These two were freebies so I don't know what make they are, and they are not marked, although one does look like it has very, very faint marks (on the scope rail mount bolts) that could be BKL? But the scope does not have the centre type mounting, split up the middle that normal BKL's have, so it might just be that the bolts are BKL, but not the scope mount?

    I will of course get round to measuring the holes at some point, and I may even have some small threaded studs somewhere, just wondering if they are a standard size.... Cheers
    :)
     
  2. shergar

    shergar Busy Member

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    Stick a drill bit in hole to find size. Ideally you then need a roll pin to fit. If threaded internally drill bit will still identify thread.
     
    pjgtech and walter Often like this.
  3. HW100Tuning

    HW100Tuning Straight Pride

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    If they haven't got arrester holes then I just drill them and make my own. I usually drill thread and use a dog point/ended grub screw with low strength thread locker.
     
  4. Brooksy

    Brooksy Posting Addict

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    Personally I'd measure as above, then use the drill bit cut down to the size of the hole in the mount, plus the hole in the rail minus half a millimetre. You'll only need a roll pin if you want it to stay located when you remove the mount. A Dremmel disc will cut it off.
     
    walter Often and pjgtech like this.
  5. walter Often

    walter Often Posting Addict

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    Nice one. I like this solution. It makes sense for sure.
    Walter
     
  6. pjgtech

    pjgtech If the Enemy is in range, so are You!

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    Nope, they have the holes, just not the pins, thanx :)
     
    HW100Tuning likes this.
  7. HW100Tuning

    HW100Tuning Straight Pride

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    Now you see that's even better... I would now thread it with the nearest thread, them use the dog grub screw.... easy peasey. With the threaded grub screw and low strength thread locker you have no chance of viibration movement on the pin. Probably not what others do... but I like stuff to be "better" than the standard design ;)
     
    pjgtech likes this.
  8. shauny

    shauny Top Poster

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    if the holes are in the mounts, just find a drill bit that fits the hole,loctite it in then trim it down with a dremel
     
    pjgtech likes this.
  9. robs5230

    robs5230 леший

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    They can be different pin diameters. Some cheaper ones are threaded.
    If its a non threaded hole in the mount, measure and use a roll pin. Its worked for Sportsmatch for enough years.
    Easy to tap up and down to correct depth.
     
    pjgtech likes this.
  10. pjgtech

    pjgtech If the Enemy is in range, so are You!

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    Cheers lads, will have a look at the weekend, I like the drill bit, loctite and trim down idea... :thumb:
     
    shauny likes this.
  11. robs5230

    robs5230 леший

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    Just a couple of thoughts on this.
    1) a drill bit will be significantly harder than the metal around it. Chances of marking cylinder will be increased.
    2) if a drill bit is bonded in it may mean mounts only fit one rifle
    3) fair chance of bonding the mounts to the cylinder or at least getting glue on the cylinder
    4) roll pins are about a quid a bagfull whereas a drill bit is significantly dearer.
     
    Geezer likes this.
  12. Scrinja

    Scrinja Trust Me

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    All that Fookin about go and buy some mounts with the pin in Dude
     

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