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Question barrel threads

Discussion in 'Anything Airgun Related' started by Kada82, Jun 25, 2014.

  1. Kada82

    Kada82 Busy Member

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    Hi all,
    Ive been reading about some hatsan barrels that have not been threaded right & tend to shoot ro the right. Last time i shot my at44 it was shooting to the right but as it was due a service i didnt put much thought to it. So if it hasnt been done right what can be done about it. Theres no warranty on gun. now ive serviced gun & sorted the silencer out it maybe ok (silencer looks like you could shoot .44 rounds thru it & not touch the sides & my at44 is 177 so ive put smaller washers inside)
     
  2. larryking28

    larryking28 Busy Member

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    Before you read about it though did you notice a problem :)
     
  3. Kada82

    Kada82 Busy Member

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    It was shooting to the right by an 1" to 2". But i put it down to the erratic power (up & down. When i serviced the gun i sorted the reasons for that. I havnt tested for accuracy yet though (weekend)

    I just want to know what to do just incase it is down to the thread
     
  4. terry1001

    terry1001 Major Poster

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    I'm not quite sure what you mean. If it's shooting consistent groups an inch or so to the right then you probably just need to re-zero your scope.
    I don't imagine that the barrel is threaded into the action so that leaves the thread for the silencer and if that's off then you could get clipping which you ought to be able to see as marks inside the silencer and would probably result in pellets scattered all over the target.
    Are you saying that you've run out of adjustment on the scope?
    A few more details and maybe more information on what you've heard about the 'thread' should help someone to provide an answer.
     
  5. Dag

    Dag Pro Poster

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    Wouldn't erratic power give a vertical variation rather than left or right?
    Have you tried adjusting scope to fire a tad more to the left?
    Dag

    edit: reading Terry's post and is the "thread" what you call the barrel rifling?
     
    Last edited: Jun 25, 2014
  6. Kada82

    Kada82 Busy Member

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    Ok
    Thread im on about is the silencer thread
    All i want to know is if a gun has a damaged silencer thread or wasnt threaded right what can be done about it ??

    There were minor things that needed sorting on my gun which have been sorted. I did forget to put in my 1st post that the mags were very tight on the pellets and accuracy was prob down to that. Should of drank my coffee before posting :/

    So question is really what can be done with a barrel with a uneven or damaged silencer thread. Can it be fixed or binned
     
  7. larryking28

    larryking28 Busy Member

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    It depends on if the silencer is affecting the accuracy though.
    If removing the silencer does nothing to improve accuracy then that isn't the problem.
     
  8. terry1001

    terry1001 Major Poster

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    The thread for the silencer is not likely to cause the silencer to fit at an angle, this thread is seldom a tight fit and the silencer mates with the cut at the end of the thread - if this is not dead square to the bore (at the muzzle end) then the silencer will be forced out of alignment. Of course if the thread is not cut concentric with the bore or is cut at an angle then it may not pull up square.
    The simple way of checking for correct alignment is to look through the barrel with the silencer fitted, best way is to remove the barrel and, holding it up to the light, look down the barrel and you will see if there is any misalignment.
    As advised above check for accuracy with and without the silencer fitted, there should be no real change in group size or point of impact.
    If a barrel has been badly screwcut then it is probable that the only way to put it right is to cut off the threaded section and then recut the thread. If the barrel is choked this would not be a good idea but it would be feasible to turn down the threaded section so that it is a clearance fit in the silencer and the cut the thread and shoulder a little further from the muzzle, this would leave about 3/4" of barrel up inside the silencer but shouldn't foul anything.
    Check to see if there is a problem before worrying about how to fix it.
     
  9. 177

    177 Donator

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    If the thread is pooched you can have someone who knows how shorten the barrel slightly, re-crown it, re-thread it (properly) or fit a sleeve and thread that to take the moderator.

    That said, if your moderator was out of alignment you wouldn't be an inch or two to the right. You'd more than likely be all over the place as the pellets clip the internals of the silencer as they exit.

    Easy way to check - remove the silencer and shoot a few groups from a bench-rest. With the mod off your point of impact may change a little.

    I had one Hatsan AT44-10 where the breech assembly was noticeably out of vertical alignment with the cylinder below it.

    I had the devil of a job trying to figure out why I was struggling to set the rig up. Get the stock level, use a plumb line to level the scope in, nip the mounts, mount the gun to the shoulder, scope is about 10 degrees out. Straighten scope in relation to action, mount the gun into the shoulder, scope is about 10 degrees out :rolleyes:

    That wasn't a fun day.

    Gun went back to Edgar Brothers and came back straight :up:

    There's just enough clearance on the barrel to crop a little off and thread it again, but it's about the very last thing I'd look at given that you could try the gun without the mod, swap the mounts around to ensure they are correctly aligned (or not, as the case may be), check the barrel bands or remove them (one allen key bolt per band) and test the gun, plus a bunch of other stuff.

    So, yes, it can be done, but I doubt that's the culprit from what you describe.
     

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