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Question AA S410 breech seal

Discussion in 'Anything Airgun Related' started by Glyn, May 9, 2015.

  1. Glyn

    Glyn Engaging Member

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    Going to look at buying a gun that is leaking air from the breech seal, had a look on YouTube and seems an easy enough job, is there anything I need to know before buying it & repairing it?

    Thanks
     
  2. Glyn

    Glyn Engaging Member

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    Anyone else done this job on an s410?

    Thanks
     
  3. mattyts

    mattyts Donator

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    I blew a breach seal out on my MPR, same design, it was a right pain to get back in, very fiddly
     
  4. Glyn

    Glyn Engaging Member

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    Thanks for the reply, is there any chance of damaging anything or just a lot of patience required?
     
  5. mattyts

    mattyts Donator

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    just a lot of patience, i found it best to fold the o ring, seat it in the groove and then run a pen tip around the o ring to seat it all.
     
  6. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

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    If there's no AT I prefer to whip the barrel out and nip it up in a padded vice as it makes access much easier. Removal is usually done with two small, sharp steel picks (taking care to to damage the brass housing).

    The new seal is fitted by sticking a pointed pellet it backwards and supporting it from the muzzle with a cleaning rod so that it sits just in front of the O-ring groove and acts as a guide for the O-ring (DON'T FORGET TO PUSH THE PELLET BACK OUT AFTERWARDS!).

    Also be aware that if the gun is a .177 the breech seal size changed at some point (I think around serial 100000 - along with the change to the "f" suffix guns) from an imperial BS 008 @ 4.47x1.78mm (AA pt. no. S536 IIRC) to a metric 4.5x1.5mm equivalent that's the same as that used on the MPR (AA pt. no. FP121) ;)
     
  7. ratman60

    ratman60 Very Active

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    hello, i changed on my FX T12 bought a dentist set with pick/ tweezers/mirror, pick out the damadged seal/ then carefull with tweezers pushed new one in using a torch. it popped in a treat with a .bit of lube
     
  8. mattyts

    mattyts Donator

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    [​IMG]
     
  9. Truckcab79

    Truckcab79 Busy Member

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    As above really. Fiddly but not difficult. Until it pops in it looks way too big for the groove it's meant to sit into, but persevere with it. Much easier access if you can get the barrel off as suggested earlier.
     
  10. Glyn

    Glyn Engaging Member

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    Thanks for that, put me at ease a bit. I'm hopefully going to look at the gun today I will keep you all posted as to my progress.

    Thanks again
     

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