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  1. O

    N/A Challenger Arms "The Plainsman"

    Looks pretty good! Thanks for sharing!
  2. O

    O Ring sizer

    Best to just measure the groove and sealing surfaces; no guessing.
  3. O

    O Ring sizer

    That, is very useful! Thanks!
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    N/A Plainsman .28 Air Shotgun

    When I get a chance, I can give you shell dimensions.
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    Air Venturi Avenge-X O-Rings

    Sounds like it needs to be modified for back-up rings.
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    Sheridan Help with my childhood Sheridan

    I had made a lead seal trimming fixture for the lathe to shape the seals to the correct size and shape. Makes assembly sooooo much easier, (less chance of cross threading the internal threads on the plug that fastens the valve body in.
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    N/A Plainsman .28 Air Shotgun

    Some good reading here: http://cinedux.com/challenger-arms-corp.php https://www.tapatalk.com/groups/americanvintageairguns/viewtopic.php?p=67905#p67905 https://www.tapatalk.com/groups/americanvintageairguns/viewtopic.php?p=53922#p53922
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    Sheridan Help with my childhood Sheridan

    [email protected]
  9. O

    Crossman 400 repeater

    The internal parts are similar to the 160. You could use this for referance: https://anotherairgunblog.blogspot.com/search/label/Crosman%20160
  10. O

    N/A Plainsman .28 Air Shotgun

    Between my son and I, we have a couple of Plainsmans, to include the .28 shotgun. Need to rework the valves on the Co2 and some multi-pump ones yet, (life keeps getting in the way).
  11. O

    Thread pitch 1/8 BSP

    Try this. See attached.
  12. O

    Electrochemical Rifling barrel, maybe we are on the right track.

    Chem milling has been around for a long time. If you were to paint the ID of a barrel with the chemical resistant coating in the twist pattern you desired, you could just put the barrel in the tank for a set amount of time and be done.
  13. O

    Other thinking about buying an avenger, for plinking and some occasional hunting. would a hand pump be reasonable or a compressor is a must?

    I have an Avenger that I fill by hand pump to 3800 psi, with reg set at 2100 psi. Refill when it gets to reg set point, (2 sets of 50 strokes each). But, I have gone through my pump to make it more efficient. Works for me.
  14. O

    Air Venturi Avenge-X regulator o-ring size

    Can you post a picture of the regulator and o-ring in question along with sealing surfaces’ dimensions?
  15. O

    Air Venturi Avenge-X regulator o-ring size

    Is it similar to the Avenger.
  16. O

    Other Xisico Sentry Burst Disc?

    Glad that you got it back together! “It would be nice if I could have my pressure gaugue there, instead of on the end of the tube. Staring at the muzzle while filling has never set right with me...” I agree with this, however, this design is the simplest to maintain tube volume. I have a...
  17. O

    Other Xisico Sentry Burst Disc?

    Should be a bag of o-rings with 2 burst disks in it.
  18. O

    Other Xisico Sentry Burst Disc?

    And yes, that is a burst disk. I like my Sentry!
  19. O

    Other Xisico Sentry Burst Disc?

    Have you tried calling Mike at Flying Dragon at about noon? I believe that Captain o-ring on Amazon has burst disk assembly and I believe that the Sentry came with a few Burst disks. My 705-9K fills to 3000 psi.
  20. O

    Other Xisico Sentry Burst Disc?

    Did you cock it prior to attempting to fill. A lot of times the hammer sits against the poppet stem which keeps it from sealing.
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