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Scope Arrestor Hole

Discussion in 'Technical' started by Rikimaru, Oct 9, 2019.

  1. Rikimaru

    Rikimaru Engaging Member

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    OK I'm probably going to get laughed at for asking this but what the hell. I have a Webley Vulcan & Tracker and even though they have been fettled and are putting out 11 (Vulcan) & 10.5 (Tracker) ft/lbs & have one piece mounts (not Sportsmatch but intending to get some as this may be contributing to creep) they are both suffering badly from scope creep.

    Both guns do not have arrestor holes. Has anyone attempted drilling arrestor holes in either of these guns.

    The thing I would be nervous about if I attempted it would be going through the cylinder wall.

    Is it feasible to drill a hole deep enough or is the cylinder wall to thin? I am assuming that guns like HW springers are obviously designed with the holes in mind, so cylinder wall thickness would account for this.

    If the idea is a non starter has anyone found a solution to this problem (bit of kit etc).
     
  2. terry1001

    terry1001 Major Poster

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    There used to be an add on mount that could be fitted to the rail behind one of the mounts and was supposed to be effective. Maybe someone will know what they’re called and if/where you can get them.
     
  3. That hurts

    That hurts Barely Active

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    Vary in price a lot, but do a search for arrestor blocks :up:
     
    SlugFest likes this.
  4. Rikimaru

    Rikimaru Engaging Member

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    Cheers for the feedback people :thumb:

    I have seen the arrestor blocks, sportsmatch & ant-supplies do them. The Ant-supplies one looks good with four bolts but they all use pins & I would rather keep the lines clean without a block stuck on the rail.
    I am not sure the blocks would totally arrest slippage.

    I am after an opinion by some of the techie members on here regarding feasibility of drilling the holes in the cylinder as I can do some work on guns but I am not 100% in my assessment abilities regarding this sort of thing (possibly weakening cylinder etc).
     
  5. Scrinja

    Scrinja Trust Me

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    Get some BKL mounts they will not slip although a tad expensive Dude
    Or order some steel mounts as the grooves are really narrow on your rifles
    The steel mounts will grip and bite into them more
     
    Last edited: Oct 9, 2019
  6. Rikimaru

    Rikimaru Engaging Member

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    I've never heard of BKL but just checked them out and they look really good.

    The BKL-260 looks very impressive. Six clamping bolts & the uni-body (no separate clamp) really looks like it would sort out the creep issue.

    For £53 I'm going to try one out on the Tracker.
    Thanks for the heads up mate.
     
    Lev Levvin and Scrinja like this.
  7. robs5230

    robs5230 леший

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    I'd look at sorting the firing cycle to prevent creep rather than masking it
     
  8. Rikimaru

    Rikimaru Engaging Member

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    Both guns have been sorted.

    Vulcan has a Welsh Willy guide/spring kit fitted, new seals all round, de-burred & polished & is working at 11ft lbs.

    Tracker has a Shauny guide kit, he shortened the spring & polished piston Again polished & de-burred. Working at around 10.5ft lbs.

    Both guns are vastly different to factory guns, recoil is much reduced but they are spring guns with rails that have no facility to stop creep like modern guns do (arrestor holes etc). They don't have piston refinements like Tx's or LGU's etc.

    The problem is not the firing cycle, its the mounting system, just rails with no arrestor facility. Any full power springer with just scope rails (no holes/block etc) will make a normal scope mount creep, it's just a matter of degree, refined guns will still induce creep, just not as pronounced.

    Which is why I'm asking about drilling.
    The BTC mounts look worth a try because of the way they are built & the 6 bolt system would seem to imply much greater grip strength.
     
    Last edited: Oct 9, 2019
  9. shergar

    shergar Busy Member

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    I find that mounts such as sportsmatch can be improved if the mating edge is, "sharpened" on a diamond stone to remove the rounding sometimes present, thereby assisting the clamp to scope rail.
     
    John Harrigan likes this.
  10. robs5230

    robs5230 леший

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    I understand the Webleys.
    I have a vulcan mk2 and I've just parted with a Brummie Longbow. Shaun made the guides for me for both.
    Neither have / had mounts fitted with any kind of arrestor system. Neither showed any scope creep.
    Both were fitted with 2pc mounts. Sportsmatch on the Longbow and Hawke on the Vulcan in the pic (now Sportsmatch though).
    Vulcan 2612.jpg walnut longbow.jpg
     
  11. Rikimaru

    Rikimaru Engaging Member

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    Nice guns. Sorry if I implied you didn't know Webley's, wasn't my intention. I was just trying to eliminate causes.
    Both my guns are civilised and I think from what has been discussed with everyone above that the mounts are the problem & yours & Shergar's posts have pretty much convinced me of that. I got the mounts with the guns & I don't think they are brilliant.

    Obviously quite hard to tell as mounts look like mounts if you know what i mean.
    I am definitely going to invest in some BTC one piece mounts & hope that sorts it.
     
    jb37 likes this.

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