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Question trouble dismantling a bsa mercury mk2

Discussion in 'Anything Airgun Related' started by samb, May 3, 2012.

  1. samb

    samb Newbie

    Messages:
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    0
    Location:
    portsmouth
    hi all
    my bsa mercury is broken at the mo, it wont fully cock and then goes of whenever, it feels like "not good!" iv read other posts on dismantling the rifle but cant for the life of me get the main trigger asembly "part be006" to unscrew from the main asembly! can anyone recoment how to get this part of as im worried about hitting it to much and does anyone have a guess as to what might be wrong ? my guess is the trigger meanism is cocking pin? any advice would be great. ps im guessing the whole trough part be006 is for a bar of sorts to help turn it ?
    many thanks
    sam
     
  2. Tron

    Tron Donator

    Messages:
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    1,372
    Location:
    West MIds
    The BSA Mercury trigger assembly is tight to unscrew but will turn. Before you do so have you first tried adjusting the sear spring? the Mercury is a old rifle and its possible the sear edges are begining to wear slightly or indeed maybe the adjustment screw has began to unscrew itself slightly making full sear engement not possible. If you must go further then you can strip all the main trigger parts out without unscrewing the trigger block. another possible cause for non engagement could be the the trigger spring, check that out as well.
     
    Last edited: May 3, 2012
  3. samb

    samb Newbie

    Messages:
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    Location:
    portsmouth
    Thanks for the reply I'll look into we're the sear screw is located and give that a go :)
     
  4. arrybash

    arrybash Engaging Member

    Messages:
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    Location:
    Heswall
    I have had my Airsporter from new circa 1975 and it had never been apart until recently. When I came to unscrew it it was very very tight and I was fearful of damaging something.

    In the end I managed to grip the piston chamber in a vice but with soft jaws gripping it to avoid scoring the metalwork. I then used a very large adjustable spanner to turn the trigger assembly (a bar through the hole in the trigger was just deforming the hole). It went eventually with no damage.

    However when I rebuilt it I gripped the flats for the pellet loader in the soft vice jaws which gave a much better grip.

    Chris
     
  5. samb

    samb Newbie

    Messages:
    3
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    0
    Location:
    portsmouth
    Thanks for your help chris iv now managed to strip it rite down and the problem seems to be 30 year old grease stoping the main piston from moving all the way back to engage the sear, be fore I force it to much I'm guessing the piston should be able to come all the way out ??
    Thanks
    sam
     

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