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PostPosted: Thu Jan 15, 2015 7:31 am 
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Joined: Wed Nov 27, 2013 12:54 pm
Posts: 518
Hi
It happened to me before after modding a rifle.
I shoot and thé cocking bolt pulls up a little every time i shoot.
It happened on another qb i tuned tout after incresing hammer spring preload.

Why?
is it thé hammer pin hitting too hard on the cocking bolt and it makes it wobble?

Any explanations from you guys?
Thank you

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Hatsan At44 Tactical .22
Steyr hunting 5 automatic
Ruger air magnum .22
Weirhauch HW100 .22
Gamo Expomatic .177
Benjamin Marauder DougP custom stock
Theoben SlR98 .22
AlEx Custom gun .22 (JezX built masterpiece) :)
Hatsan Atp2


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PostPosted: Thu Jan 15, 2015 11:39 am 
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Joined: Sun Aug 10, 2014 2:11 pm
Posts: 39
the bolt isn't fitting tight enough in the recess, allowing it to turn, due to the air pressure coming from the transfer port. a quick fix is to wrap a little scotch tape around the bolt handle. if it's really a loose fit, some heat shrink will work. you may also be able to move the barrel back, to take up the slack. sometimes, this requires removing a little of the breech end of the barrel.
the root cause is that the bolt is not "bottoming out" against the tapered part of the barrel's breech, and, compressing the bolt o-ring.


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PostPosted: Thu Jan 15, 2015 2:36 pm 
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Joined: Mon Sep 05, 2005 10:55 pm
Posts: 6845
Location: Rocky Mtn Hse Alberta
Maybe try s new bolt oring

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PostPosted: Thu Jan 15, 2015 3:23 pm 
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Joined: Sun Jan 09, 2011 8:07 am
Posts: 3320
Location: Central West River Nova Scotia
I must have missed something, but what gun are we talking about. If its the 2240, mine pops up every shot with the Hipac.
But like Walter said, I probably need a new probe O ring.

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PostPosted: Thu Jan 15, 2015 6:55 pm 
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Joined: Wed Nov 27, 2013 12:54 pm
Posts: 518
Sorry guys forgot to mention. I have this little problème with two of My rifle one on thé qb78 cock open i am working on ans another on a custom jezx GUN call thé AlEx i tuned fort shot count but i think on both rifle i have pût a hammer pin that was toi long. I will try to réduve it and sée what iy will Côme up with.

At thé end of thé day i think it woulf i gold thung to ask fort oters opinion has it happened to me a few times on the past.

_________________
Hatsan At44 Tactical .22
Steyr hunting 5 automatic
Ruger air magnum .22
Weirhauch HW100 .22
Gamo Expomatic .177
Benjamin Marauder DougP custom stock
Theoben SlR98 .22
AlEx Custom gun .22 (JezX built masterpiece) :)
Hatsan Atp2


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