FX IMPACT MKII PELLET PROBE DANGER (AGAIN)!

Forums General Discussion FX IMPACT MKII PELLET PROBE DANGER (AGAIN)!

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    Spray1Mark
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    I know this has been discussed but I just need to add that I could no longer shoot my MKII with the design as it was!

    With the new power levels being attained by the MKII, near on 100FPE the pellet probe screw is simply not upto the job IMO!

    I found that after 10-20 shots no matter what I did the probe screw came loose (not loctited) and the damage to the screw was serious enough for me to be concerned that it may sheer.

    So modified the probe retention by opening up the threaded hole in the block to clear an M4 screw and threading the probe all the way through M4.

    I was worried that this may affect the presentation of the probe into the barrel but if you do it correctly it does not, the difference in the clamping force is staggering and much more reassuring, no backing out of the screw after doing this and still no need to Loctite.

    The screw is a special low profile M4 caphead, the head diameter reduced to 6mm to clear the slots in the rear plate and the rear plate has been recessed on the milling machine to allow the head of the screw to sit proud.

    I am very happy with this modification and in all seriousness think it should be implemented by FX in some similar way, the original screw is a danger at the MKII power levels IMO as I said before.

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    jwrabbit123
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    I think fx should have some sort of retro kit to remedy this  long ago ,Especially now with power levels where they are at , Just so I am clear you went from 1.5mm to 4 mm ?

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    Keyman62421
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    Did this a couple years ago when my probe screw wouldn't hold.  Ernest has video where he drilled rear of block. Put screw behind probe.  Might look it up!  Have seen drilling from opposite side to have 2 screws.  I think the rear screw is the answer to retaininjg probe.  However proper alignment of probe screw is critical for port alignment.

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    bandg
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    Question from someone planning to buy an Impact-is the pellet probe solid behind the port hole or is it hollow for a distance?

    All good information above, very helpful.

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    Fire_at_will
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    It is solid.

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    Spray1Mark
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    jwrabbit123

    I think fx should have some sort of retro kit to remedy this  long ago ,Especially now with power levels where they are at , Just so I am clear you went from 1.5mm to 4 mm ?

    To M4 correct!

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    edosan
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    Never had a problem with that screw or the probe with my impacts, but I understand it could be. Good mod!

    • This reply was modified 8 months ago by edosan.
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    jwrabbit123
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    thanks spray .

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    Spray1Mark
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    edosan

    Never had a problem with that screw or the probe with my impacts, but I understand it could be. Good mod!

    I don't suspect most would running at the "normal" pressures edosan, however the problem seems massively exacerbated with the really high pressures the extra power the MKII allows you to run at.

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    Lewis
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    I have not had any issues with this bolt yet but this is a great Idea! I will so be doing this during the next rainy day.

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    edosan
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    Spray1Mark

    edosan

    Never had a problem with that screw or the probe with my impacts, but I understand it could be. Good mod!

    I don't suspect most would running at the "normal" pressures edosan, however the problem seems massively exacerbated with the really high pressures the extra power the MKII allows you to run at.

    I know, but I don't do Normal Pressures, and I have never got that screw loosen, and I change that probe a lot. I like your mod tho, better be safe.

    • This reply was modified 8 months ago by edosan.
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    Spray1Mark
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    How I noticed was that the probe kept dropping and so came out of line with the barrel, every time I checked it was loose. I use a torque wrench set at the correct torque for a screw that size so I know I am consistently tightening it.

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    Spray1Mark
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    Tried the mod perfect, used the old version onm yother Impact and the screw is still backing out.

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    Glem.Chally
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    Spray1Mark

    Tried the mod perfect, used the old version onm yother Impact and the screw is still backing out.

    Have you used green loctite? Or just putting in and snugging it up?

    When you had issues with the original set screw.

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