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Zbroia Kozak Shroud

Discussion in 'Technical' started by Artie, Apr 24, 2019.

  1. Artie

    Artie Well-Known Member

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    Hello everybody. I have been reading posts on this forum for sometime & have found it extremely informative. Thought it about time I joined.
    Today I have become the proud owner of a Zbroia Kozak (short version). I have tried it at the range & am very impressed. However it took quite a number of shots for accuracy to establish & it is not quite there yet.
    I feel that the barrel may need a good clean but as pull through will not pass through baffles, I need to remove the shroud. Can anyone give me a definitive answer (with pics if possible) of how to do this. I have seen similar questions asked before but answers have varied. Does the shroud simply unscrew or do I need to remove end cap where unf/external silencer attaches to shroud?
    Any advice or hints greatly appreciated.
     
    talent and billy.whizz like this.
  2. Petay

    Petay Donator

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    Should just unscrew anti clockwise mate and it will definitely need a clean
     
    PBaz Barrett likes this.
  3. Kev The Fish

    Kev The Fish Buxted Rifle Club Member

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    Hello Artie
    Yes the shroud simply unscrews anticlockwise. Just remove and clean with pull through if you like. Some have cleaned their barrels others have left alone and those who left them mainly seem to have suffered less accuracy issues. Mine is slowly leading in and tightening groups up. But is back for a repair to seals I assume as the moment due to slow air leak so sorry I can't send pictures.
    They seem to prefer middle to heavy weight pellets. Lightweight ones in mine anyway (Daystate LI's) were about the only pellets out of about 10 types tested that scattered over about 2" at 25m.
    JSB Heavies seem to be favoured
    Bisley Magnum/H&N Barracuda also pretty good
    H&N FTT'S were good
    JSB Diablo's good
    RWS Superfield also good
    As were Crosman premier (heavier ones)
    The barrels don't seem to be very fussy but will probably need feeding 5-6 mags at least of your favourite pellets to start gradually tightening your groups up (or that's what I seemed to find)
    Good luck & well done on your choice of rifle
    Kev

    .
     
    markturver and billy.whizz like this.
  4. Jukebox

    Jukebox Posting Addict

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    Doesn't need cleaning mate....just put pellets through and it will settle.
    Worst thing I did was clean mine and it took ages to settle down again.

    If you do insist in cleaning then dont bother removing the shroud.
    Get a drinking straw and push it down the end of the barrel...dont release it and if it's the right sized straw it will stop itself as the barrel is too tight to fit down.
    Push the pull through kit down and hey presto....easy peasy lemon squeezy:thumb:
     
    billy.whizz and Kev The Fish like this.
  5. Artie

    Artie Well-Known Member

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    Thank you all so much for your advice. You are correct - the shroud simply unscrews. I was being cautious & didn't want to force anything!! Barrel not as dirty as expected!
    Thanks for pellet advice, Kev. I tried RWS superfields & crosman Premiers today. Started off with near shotgun grouping but after fifty shots or so reduced to around an inch (25m) but still with a few wild flyers. I was using a large (Logun) silencer which I suspect might be affecting accuracy. Also using an older scope which could have some issues.
    As you can see, I have plenty of experimenting / tinkering to come! It took ages to find the best pellets for my HW100KT (Baracuda FT) which is now pellet on pellet at 25m, so I have loads of half used tins knocking around to try.
    Hopefully gun will be leak free. Supplier held it for a week filled to 300 bar, before sending it out.
     
    billy.whizz likes this.
  6. Kev The Fish

    Kev The Fish Buxted Rifle Club Member

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    The Barracuda FT did give reasonable groups in my Kozzy. But once I get it back I will be trying loads of JSB Diablo's & Heavies through it and see if the groups tighten up
    I did do some strings under another Kozak thread about a week or so ago with a small pellet grouping pic but need to feed more through to settle it down as stupidly cleaned barrel and now taking a fair bit to lead in and settle.

    .
     
    billy.whizz likes this.
  7. RichieRich

    RichieRich Kozak Advocate

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    Try the JSB Heavies, this is 2 full mags at 30m. That 5p covers the hole

    2019-04-22 10.55.23.jpg
     
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  8. Artie

    Artie Well-Known Member

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    Wow! Will be more than happy if mine groups as well as that! Looks like I need to try some JSB heavies.
     
    Jukebox and billy.whizz like this.
  9. PBaz Barrett

    PBaz Barrett 'I love slinging lead me!'

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    Nice shooting, Yes i also had mine out this afternoon (.177 short). I was smashing acorns @ 80 - 100 yards. Super chuffed with it..
     
    billy.whizz likes this.
  10. Kev The Fish

    Kev The Fish Buxted Rifle Club Member

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    Though I would repost this if it helps on possible pellet choices


    Results are not awful but not as tight as I normally do with my S400 (no real surprise as mine is a laser and I am really used to that set up)
    But I hope you can see below as my camera on phone is not too good and used paper not card so a bit ragged and ripped looking.

    From left to right (Full 12 shot Mag in each)

    Top Row
    H&N Barracuda FT
    Couple of fliers but maybe able to tighten up with more lead fired.

    Row 2
    RWS Superfield
    Seemed to start creeping up gradually
    Again more lead run through may tighten groups.

    Row 3
    H&N FTT
    Odd shot moved out of main groups but showing a lot of potential.

    Row 4
    Bisley Magnum
    These were old pellets and not best condition hence this may explain odd flier. But again not awful and some new ones (or H&N Barracuda- same pellets basically but cheaper) may tighten up.

    Overall not awful but I think some is down to Regulator throwing first couple of shots at higher velocity when left around 5-10 minutes
    Also found it is not getting anywhere near the amount of claimed shots per fill.

    I can shoot better (honestly) as in bottom picture at 25m outdoors on a challenging windy day (with S400 & Cheap Chinese Scope)

    I hope it is fixed soon so I can really give a decent test
    With more than 2-3 Mags of different brands to give it a fair test. (Was hitting the spinners, knockdowns and the bell fairly easily using Bisley Magnum & FTT's)
    Kev

    .[​IMG][​IMG]

    .
     
    RichieRich likes this.
  11. billy.whizz

    billy.whizz Busy Member

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    Artie, welcome too the club ,I hope you enjoy your new toy, and it makes you smile , most on here have enjoyed theirs . you say your supplier held your s for a week at full pressure ! who was your supplier please?.
     
  12. Petay

    Petay Donator

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    The barrel really should be pulled through, the Hortitsia I had was full of gunk. All barrels will be off after a clean and need leading in, the amount of leading in varies barrel to barrel as does how ofter it will need a clean there after. Many barrels never need a clean again but a clean from factory is best practice.

    Any regulated gun should probably be dry fired once or twice when it's been left for a bit, then start shooting your group.

    I've not stripped a Kozak but imagine barrel removal is the same as the Hortitsia in which case i'd remove it for cleaning. While its out check the TP as my Hortitsia was a little rough so i de-burred it.

    As for pellet choice, JSB JSB JSB. Thats what i am told Zbroia recommend. My Hortitsia liked Exacts in 4.52.

    Have a look at the first post in this thread, shows what the Zbroia barrels are capable of once set up.
     
  13. Artie

    Artie Well-Known Member

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    Thanks for the welcome & thanks to everyone for all the helpful advice. I purchased via Big Dan's Airguns & he arranged with his supplier to hold the rifle to ensure regulator seated & no leaks etc. Dan has been fantastic with his advice & I feel confident that if
    any problems are encountered he would offer the required support.
    Think a trip to the range later today is in order! Will update.
     
    GLB and billy.whizz like this.
  14. PBaz Barrett

    PBaz Barrett 'I love slinging lead me!'

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    I must say, I filled to 300bar and left my kozak a few days then shot it until it fell off reg. One thing I have noticed since, is that the pressure gauge on rifle now reads cock on. it
    read 20bar lower than actual pressure previously.. Also 1st 2 shot's after standing a while are now not as pronounced (higher).. :thumb:
     
    Artie and billy.whizz like this.
  15. GLB

    GLB Busy Member

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    likey likey jsb 4.52 8.4 grains exacts but it's good with most quality pellets IMG_20190303_155712367.jpg
     
  16. PBaz Barrett

    PBaz Barrett 'I love slinging lead me!'

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    Yeah impressive stuff.. What range was that at?.. I find my Kozak likes the 4.52 10.34's.. I find them more stable at ranges 40-60 yards..
     
    billy.whizz likes this.
  17. Kev The Fish

    Kev The Fish Buxted Rifle Club Member

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    Must admit my gauge also seems to show around 20 bar less than bottle, I know they often show a bit lower, Think my S400 shows around 10 bar lower. Can't wait for mine to be returned so I can keep testing. Will try shooting her right down too...thanks for the advice
    Kev

    .
     
    billy.whizz likes this.
  18. Kev The Fish

    Kev The Fish Buxted Rifle Club Member

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    Come on mate
    Get that head position correct or give it 1 click adjustment you are almost half a pellet out there

    .
     
    billy.whizz likes this.
  19. billy.whizz

    billy.whizz Busy Member

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    mine is being picked up this sunday, taking my new toy away too fix it hopefully!, cant wait too get it back and get too shoot it properly and see the pellet go where I point the rifle.:)
     
  20. GLB

    GLB Busy Member

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    i have a twitch ;)
     

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