Hammerli AR20FT zero shift conundrum

Discussion in 'Others' started by Willbe, Jun 15, 2013.

  1. Willbe

    Willbe I Like BIG Hats!

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    Cheadle, Staffs
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    Did anyone ever get to the bottom of sorting this? Seen some radical solutions involving milling off the entire barrel shroud but if a hamster is mounted directly on the area of the shroud mounts i.e. as far to the rear as possible would this alleviate this (because any upward forces are on the shroud mount not forward of it so preventing a lever action forcing the barrel up) or would further reaming out of the barrel shroud be required say up to 0.5mm to give the barrel further free space? Thoughts?
     
  2. paul4be

    paul4be Why do I bother????????

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    I found that when rested or when I was sitting, POI was spot on. When standing, the chassis moved slightly due to "leverage" because of the hamster. It pulled the barrel down.

    All I needed to do was cut the front part of the shroud off, in line with the angled front of the chassis surrounding the cylinder. This was enough to allow the chassis to move without affecting the barrel itself.
     
  3. Willbe

    Willbe I Like BIG Hats!

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    Where was the hamster mounted in this case Paul?
     
  4. paul4be

    paul4be Why do I bother????????

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    I'll measure the location of the 2 posts for you.

    When standing, I hold the hamster behind the rear post, so that point acts as a pivot it seems.
     
  5. cozypom

    cozypom New Member

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    ar20

    give it to me to mod ?
     
  6. Suzukiphil

    Suzukiphil Member

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    John Sears does really well with his. As far as I know he has fitted a quickfill and keeps the hamster as far back as possible to stop the chassis movement. He seems to think he's solved POI problems, his scores suggest he has!
     
  7. ccolbeck

    ccolbeck New Member

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    Location:
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    Guiseley FTC
    O Ring

    I found removing the o ring between the barrel and shroud allowing the barrel to float free of the shroud cured the problem on mine.
     
  8. Akita

    Akita Member

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    Greyhound & Purley Chase
    I found on mine the barrel and shroud alignment was way off so different temperaures often gave POI shift.
    I just milled the bloody thing off problem solved and because the barrel is fully free float no hampster issues no matter where you posistion it.
     
  9. tugg

    tugg itchy trigger finger

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    and with it removed could you see how it would cause problems, I know I did.:eek:
     
  10. boyo

    boyo Banned

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    Location:
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    Hello
    wouldn't removing the shroud or part of it leave the barrel at risk to damage from knocks and bangs against things like trees posts and everything else. JMO
     
  11. Akita

    Akita Member

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    Its a solid barrel and it goes into the action at least 3 inches i wouldnt be to concernd.
    But then again i dont go around bashing my guns against trees:D
     
  12. tugg

    tugg itchy trigger finger

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    I'm not the most carefull person but I would struggle to damage the barrel.
     
  13. boyo

    boyo Banned

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    shroud removal

    But then again i dont go around bashing my guns against trees:D[/QUOTE]

    why the stupid reply, I dont think anyone deliberately gose around bashing their guns against obticles.
     
  14. PaulD

    PaulD I like Feinwerkbau's

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    Location:
    Warrington N/W England
    Club:
    Tawd Vale FT&ARC
    I'm struggling to understand how you can tell if your POI has moved while taking a standing shot? You must be one hell of a good shot! I have problems keeping the crosshair in the kill never ming knowing the poi has shifted when taking a stander:eek:o
     

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