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Advice Aligning Smk qb 78 deluxe

Discussion in 'Anything Airgun Related' started by Village, May 28, 2015.

  1. Village

    Village Member

    Messages:
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    Location:
    Darlington
    Hello everybody,

    This lovely rifle has had the internals improved, including a metal barrel clamp at the end of the stock. This clamp screw I gave tightened, as I noticed a slight movement with the barrel. The screw and nut look cheap metal.

    On fixed firing at 14 yards, shots are spread over a 3inch area.

    So, is the answer to replace this machine screw and nut with a more substantial one would anyone advise?

    Thanks.
     
  2. hmangphilly

    hmangphilly Busy Member

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    dont know this gun chum, but a barrel clamp attached to the stock sounds like a bad idea.

    mind you , movement of the barrel isn't going to help your accuracy .

    is there any other way of securing the barrel ?

    3" group at 14 yrd is very undesirable
     
  3. Stevie Darling

    Stevie Darling Sexual tyrannosaurus

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    Location:
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    Are you using a silencer??
     
  4. gunsnlandies

    gunsnlandies Busy Member

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    Get a bolt set from Will at Woodfield. They are all hex key bolts. The only one not replaced is the front trigger screw.
    http://woodfield-gcp.co.uk/?product=qb78-qb79-seals-bolts-kits
    The barrel should be tight enough at the breach not to move. I have drilled and tapped another hole in that area. It is now held with two grubscrews. This was done as I have carried out the barrel to valve mod with home made TP seal.
    Check the crown as they can be hit or miss. I had a XS78 which hadn't been crowned at all.
    Ignore the barrel clamp remark. As Stevie says, have you got a silencer fitted, and the pellets are clipping.
    Join UKCAF, everything you want to know about the 78 can be found there.
     
  5. Village

    Village Member

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    Hi,

    yes, a silencer is fitted.
     
  6. tommy gun

    tommy gun Posting Addict

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    try with out the silencer
     
  7. laserman

    laserman Well-Known Member

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    wolverley
    78 or 78deluxe?
     
  8. Village

    Village Member

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    Thankyou, following up now.

    Without the silencer is the same.

    Firing at 11ft pounds and very easy to load and fire. The build and mechanicals are excellent, just aligning issue now.

    Thanks.
     
  9. tommy gun

    tommy gun Posting Addict

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    Location:
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    have you checked to see if the barrel is straight it should still be hitting the same place with out the clamp on
     
  10. Darren Petts

    Darren Petts Temporarily Alive

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    Check the breech bolts are tight and the barrel to breech bolt/bolts. Try different pellets too.
     
  11. laserman

    laserman Well-Known Member

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    Location:
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    Make sure you are are doing your tests with fresh CO2 cartridges in otherwise you'll never get it right. And if you remove the barrel band it will make a massive difference as the design of the barrel bolt is s**t. The barrel will wobble all over the shop.

    Are you trying to zero it in with a scope??? If so try another one. And is it a smk QB78 or 78D?
     
  12. xboxmoddr

    xboxmoddr Engaging Member

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    Cleethorpes ne lincs
  13. Village

    Village Member

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    Thankyou.

    the pellets are twin ring pointed standard mil bro I believe, I have Bisley super field en route to test out on Wednesday.

    thanks.
     
  14. Darren Petts

    Darren Petts Temporarily Alive

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    The pellets you are using are pants. Pointed pellets are only made to sell to those who don't know better. The best pellet is almost always a decent domed one such as JSB, AA Field, Accupell etc.
     
  15. laserman

    laserman Well-Known Member

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    Is it .177 or .22? Use superdomes mate and stay away from fancy pellets
     
  16. Seanalf

    Seanalf Engaging Member

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    Falcon accuracy plus were the best for my QB, closely followed by Superdomes and H&N FTT, all in .22 flavour. Milbro are sh*te, check your crown as well, I had to re-do mine and it made it a great little gun
     
  17. Village

    Village Member

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    Location:
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    Hi everyone,Great, I'll look over all your comments shortly.Milbro twin ring pointed .22 pellets have proven very poor. Using Bisley super field has improved a 3" group at 14yds down to 1" group, which I still consider very poor.How accurate can a SMK qb78dl be???I'll follow this up shortly and hope others can benefit from the above.
     
  18. Seanalf

    Seanalf Engaging Member

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    Location:
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    After a bit of tinkering (I've had 5 of these), I could get sub 1" goups at 40yds with some great consistency. They are an easy gun to work on, find a pellet it likes and go from there. Sounds to me like the crown needs doing and internal polishing to make the airflow more consistent. The better the flow, the lest fluctuation on power. Don't forget, co2 can be temp affected, so your point of aim can shift with higher/lower temps, don't leave it lying in the sun!
     
  19. laserman

    laserman Well-Known Member

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    I had mine doing pellet on pellet at 25yards.
     
  20. inbo36

    inbo36 Member

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    Location:
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    be aware of temperature!

    If it is at 11fpe in this weather it will be way over in summer weather! These can go up 2-3 ftlbs easily with temp.increase.
     

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