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Newbie. Question about scopes on break barrels

Discussion in 'Anything Airgun Related' started by Onslo, Dec 1, 2008.

  1. Onslo

    Onslo Member

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    Greetings from a newbie

    I have recently purchased my first firearm and chose a 177 FWB Sport 124.

    This rifle has a scope fitted and I am finding the accuracy less than I expected. It is grouping about 50mm at 25 metres. I am wondering given that the scope is fitted to the stock half of rifle and the barrel could be seating in a slightly different position each shot, if this is not really a suitable rifle to fit a scope to? Should I remove the scope and find a new front sight or should I go through the rifle and put a new spring and seals in first. It seems to have a lot of spring "twang" but I am not sure if this is excessive.

    Any help greatly appreciated.

    Onslo
     
  2. i8allthepies

    i8allthepies Posting Addict

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    How old is the rifle?
     
  3. Onslo

    Onslo Member

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    thanks davylloyd

    It is probably 25 years old. But exceptionally well cared for and has not had a lot of use apparently.

    Onslo
     
  4. Darren Petts

    Darren Petts Temporarily Alive

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    Barrel lock up can be measured with a laser hard fastened to the barrel. It'll vary against the scope at distance if the barrel is not locking up perfectly.

    Are the breech jaws tight? Test for slack and either tighten the breech jaw bolt or use a vice if there isn't one. Next is the locating mechanism free and well lubricated and is the breech seal in good order.

    If your groups are strung vertically it's a sign of poor lock up. If the groups are round then it could be loose jaws or it could simply be a bad choice of pellet. Every barrel likes different pellets so try some others.
     
  5. Onslo

    Onslo Member

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    Thanks for the responses, is it OK for a scope?

    Thanks for the rapid responses. I assume since no body has said it is not a suitable rifle to have a scope mounted to, then it must be OK?

    I did tighten the two hinge screws and these were not very tight. They are now, but still poor groups even in the hands of a very good shot who is a local airgun expert.

    The grouping is not just vertically astray but is out in all directions, this is worse with some pellets. I have tried about four different pellets that were given to me when I purchased the rifle. I also bought some Gamo match pellets but these were very similar.

    The Oring at the breech does look a little compressed. I might replace it and retest. Are these any special Oring or an off the shelf metric series.

    Everything is very clean and well lubed. the mechanism feels very snug and positive.

    Many thanks Onslo
     
  6. i8allthepies

    i8allthepies Posting Addict

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    If you can lay your hands on a chrono, a series of shots will tell you if the muzzle velocity is consistent - if not, then it points to a worn breech seal and/or slack lock up. I would suggest you buy the correct seal rather than an 'off the shelf' o-ring. Try a series of shots where you give the barrel a smack with your open hand, just in front of the breech, on the left hand side before each shot, then repeat hitting it on the right, if this shows any marked difference it suggests a worn pivot point. It may still be that you haven't found a pellet that the barrel 'likes', try H&N, RWS, JSB, Webley/Crossman etc. Hope this helps:up:
     
  7. Onslo

    Onslo Member

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    thanks davylloyd once again

    You have been very helpful. I will do as you suggest. I am not sure about finding a chronograph, but will ask a couple of blokes I know that may know.

    So do you see a scope fitted to this rifle as a viable option or should they be restricted to fixed barrels?

    I was advised that a scope on a break barrel is not a good idea but the FWB is one rifle that is well made enough for it to be workable. Would you agree with these sentiments?

    Many thanks

    Onslo.
     
  8. Rockabilly

    Rockabilly Big Poster

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    a scope should be fine on your fwb ,as your gun was and still should be one of the finest break barrels ever made, in england the .177 version is highly sought after. are you sure its not your scope or mounts that are causing the problem, do you have a silencer fitted? if so remove it and see what your groups are like without it.
     
  9. i8allthepies

    i8allthepies Posting Addict

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    Good suggestions, Rocka:up:
     
  10. norris

    norris Engaging Member

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    How about a cleaning the barrel? send a picture to the forum
     
  11. Onslo

    Onslo Member

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    Thanks very much for all your help. The rifle has not had a silencer fitted, although I would like one but not if it compromised accuracy(that is assuming I can get it firing straight) I have fund a chrono that I can test it on tonight and I have given it a very thorough cleaning.
    I will post the results of the chrono and try to put some pictures up as requested so long as I don't stuff up and make them too large.

    Till then.

    Onslo
     
  12. Onslo

    Onslo Member

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    best seal kit for FWB 124? No power restrictions!

    I have found we have an FWB agent in Tasmania so I am going to ring him today and order a new spring, breech seal and piston seal.
    I have noticed several brands and tune up kits are available for it. What do you recommend? We do not have any power restrictions on air rifles in Australia, but you need a license for even low powers. Given we have no limit is it possible to improve it?

    Many thanks

    Onslo
     
  13. Andy

    Andy Administrative Staff Member Founder

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  14. 12BoreMax=P

    12BoreMax=P Posting Addict

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    may be a silly question but , is your scope niped up tight , or too tight as it may be creeping about a put :D
     
  15. Onslo

    Onslo Member

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    Chronoed and found variable

    Well we did the tests tonight on the chrono and found the shots varied by more than 10% around 630 - 720 fps with the fastest pellets. These were 7.2 grain match pellets. This demonstrates the rifle must be down on performance, so I ordered a new seal kit for it off a Canadian eBay store tonight.
    We also found the scope mounts a little poor fitting on the dovetails so I am looking to find a set of steel ones that fit better than the alloy ones I have.

    I am not sure about the correct tightening sequence for the hinge screws as there is a large one on one side of the barrel and a small one on the other. I loosened both right off then tightened the large one up as tight as I could manage without damaging the flat screw driver slot, then I proceeded to tighten the small one up to the same. This made the rifle shoot to the left more than the range of the scopes adjustment. The groups were still poor, so I am not sure what to think there.

    Regards Onslo
     
  16. dazgib70

    dazgib70 Engaging Member

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    could be that you may just need a new spring!
     

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