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HW99s tune

Discussion in 'Anything Airgun Related' started by Tinbum, Apr 2, 2014.

  1. Tinbum

    Tinbum Delusions of adequacy

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    After posting in the sales section for my drop in tuning kits, I had a local member contact me to ask if I could tune his 99 for him. We met yesterday, talked guns for a bit and I learnt what it was about the gun he didn't like.
    Usually, the 99 is a sweet little gun straight out of the box, especially in .22! So I was surprised to hear the list of things he just wasn't happy with.

    I gave the rifle a test when I got home last night and saw what he meant. Now, I stripped mine down the day I bought it and started tinkering, so its probably not fair to compare a stock gun to what I've been using for months, but blooming eck! What a racket!:eek:

    Lets start with the trigger. It was too long a reach, the first stage was silly and it was very creepy. The gun went off with a helluva TWANG! with quite a bit of recoil to match.:(

    Mission accepted!

    On stripping the gun I could see one problem immediately. The piston had scuff marks where high points were rubbing along the cylinder. This is never a good thing, so I skimmed the tiniest amount off on the lathe and then polished it with emery until it was all lovely and smooth. The spring itself looked ok, so it was degrease and a quick clean of the ends before refitting. A Pepsi bottle gave up the last of its contents in the ultimate sacrifice so we could have a piston sleeve, this was fitted in with some lithium moly grease and one of my kits.
    The kit itself comprises of a delrin spring guide which is shorter than stock, with a long top hat and slip washer. This keeps the spring supported along its whole length when cocked, and allows it to unwind without hindrance on firing. Another thin coating of moly on the piston and the gun went back together.

    Before fitting the Rekord trigger I brought the blade back a few mil, shortening the first stage and adjusted out the creep. After it was all together I also adjusted the trigger weight to my preferred setting, hopefully the owner will like it that way, although that's easy to change if not.

    I had also been asked to fit one of my barrel sleeves, which I did, and even if I say so myself, the end result really does look the business!

    The gun is firing superbly now. No twang, a nudge straight back for recoil and it feels altogether faster.
    oh, and I re-parallaxed the scope too!

    John, your guns ready!:D
     
  2. 177

    177 Donator

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    Smarty pants :)

    I'm very interested in your HW99s top hat and spring guide - it follows my own preference for a longer top hat.

    Great result for your client and it demonstrates the realistic possibilities and attainable goal state end users might expect to enjoy.

    Top banana :)
     
  3. mattyts

    mattyts Donator

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    Lathes,endless possibbilities :D
     
  4. davidif

    davidif Well-Known Member

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    Looks superb.
     
  5. Jackroadkill

    Jackroadkill Donator

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    Fair do's, that piston in the stock state looks a hell of a mess. End result looks grand.
     
  6. valboskie

    valboskie Busy Member

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    very nice work the owner should be very happy with what you have done
    atb
    David
     
  7. MADEinSTOKE

    MADEinSTOKE Engaging Member

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    Them barrel shrouds really do set the gun off....so tempted to get one myself.....hmmm decisions,decisions
     
  8. bripard

    bripard Engaging Member

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    Hi, how are the barrel shrouds attached to the barrel?
     
  9. 177

    177 Donator

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    Out of curiosity, does your service include minor customising to shorter than standard dimensions ?

    Shrouds don't really blow my skirt up but I might be persuaded for one to fit my carbined HW99s barrel, with enough space built into the business end to install some sort of baffle arrangement for moderation purposes.

    I'm thinking this, with a shroud instead of a moderator:

    [​IMG]

    And, yes, I'm a tart and I like pimping that photo :)
     
  10. mattw975

    mattw975 Big Poster

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    Has anyone tried a top hat & spring guide of equal lengths, I'd be keen to give that a crack ;)


     
  11. Jonnyovy

    Jonnyovy Very Active

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    Also what i had been thinking. A over sized shroud then play about with baffels.
     
    Last edited by a moderator: Apr 4, 2014
  12. Tinbum

    Tinbum Delusions of adequacy

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    I should be sending a load off for blueing next week. Make sure to let me know if you want one reserving.
     
  13. Tinbum

    Tinbum Delusions of adequacy

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    This one is purely a friction fit, no loctite was necessary, but they can be tapped for a grub screw.
     
  14. Tinbum

    Tinbum Delusions of adequacy

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    The minimum spring guide is defined by the distance to piston rod. Once you know that the worlds the mollusc of your choice!
     
  15. Lydford

    Lydford Posting Addict

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    You are doing a great job Tinbum. Love reading your threads.
     
  16. tomsteebs

    tomsteebs Donator

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    How can you put a shroud on via friction, but it doesn't work loose or rotate?
     
  17. Jackroadkill

    Jackroadkill Donator

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    Make it 0.25mm too long and use the pressure given by the screw-on moderator to hold it on?
     
  18. Tinbum

    Tinbum Delusions of adequacy

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    Its a very close fit and you file the front dovetails down barely enough to get the shroud over them.

    Presto-chango! A damn tight fit that is a real struggle to remove.:)
     
  19. Tinbum

    Tinbum Delusions of adequacy

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    I have something in the pipeline for modded barrels..........:cool:
     
  20. tomsteebs

    tomsteebs Donator

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    I'll get you my dimensions for the tracker over, think I'll leave the longbow for now if you ideas for silenced barrels....

    I just find in confusing how a tube can fit on a tube and not move without stratching it like a grub screw :) unless you use delrin centralizing washers....

    Cheers for info
     

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