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Technical Cp1 Stripdown Guide (cp2)

Discussion in 'Air Pistols' started by Nubble, Apr 4, 2019.

  1. Del-Dredd

    Del-Dredd Engaging Member

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    Will take the comments about TR Robb under advisement and make note of John Small, (has he got a website ebay shop etc) and of course ped for Seals and TP's (contact here I presume).
    Got spare seals at moment so no problem with them.

    Tried the CP2 before lunch with Nubbles upgrade springs, Trigger is good, Hammer Spring not improved shot count by much at all,
    maybe due to being 22 not 177 and shooting at 30 yards, CO2 out of puff at 51 shots with the last 9 dropping off poi by inches.

    Will be trying again in few minutes as was mostly re zeroing the CP2 and Superstar after scope swaps, will take accurate count this time.
     
    Nubble likes this.
  2. ped

    ped Keyboard Hero

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    John has no website but can be contacted on cheesebook and his work is top drawer and that's not biased as he is a good friend
     
    Del-Dredd likes this.
  3. Inca

    Inca Busy Member

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    Thanks almost entirely to Nubble's sticky I’ve stripped and reassembled my first ever air gun and with no parts left over I’m declaring it a success. All thing that needed polishing were polished, Nubble's replacement springs (trigger and piston) were inserted plus the trigger adjusting screw all of which has transformed the trigger action. Not quite up to Steyr standard but a factor different to what it was. With the new piston spring I’m getting an extra 10 useable shots, 55-65. Cocking was always a ratchety affair that I wanted to sort. The slot in the main tube had more serrations than a bread knife that my thumb and Mr Band Aid can testify to. I managed not to get blood on the gun and filing / polishing those serrations away sorted out that problem. Out came the bolt to give that a degrease and lube but problems occurred trying to put it back. Not shown on any exploded diagram I’ve seen thus far is a grub screw and ball bearing underneath the breach that acts as a restrictor to stop the bolt flopping about when cocked but not forward <terminology might be a little off here>. The ball bearing had moved into the bolt's path stopping the bolt sliding into the breach. Once that problem was recognised just a second to fix.


    I bought the CP-1 both as a very cheap alternative to my target pistol while I’m airless and (having seen Nubble's guide) something to lose my fettling virginity on. Huge thanks then to Nubble for popping that particular cherry. The pistol is great fun for not a lot of money and delivered straight to my door from the Netherlands in just 3 days. Completely useable straight out of the box but not without problems that are very easy to put right
     
    Nubble, Del-Dredd and ped like this.
  4. shadowryder

    shadowryder Shootin' the Breeze!!

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    Yeah but you can advise on the best people for the job in hand mate.
     
    ped likes this.
  5. Del-Dredd

    Del-Dredd Engaging Member

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    Ran the CP2 through a few cartridges after lunch, switched back to the original Hammer Spring on my .22, the extra few shots were not worth the drop in point of impact of inches at 30 yards after 30 or so shots.
    The original spring manages 40 shots before it drops by an inch, another 5 to 8 and you can tell by sound and immediate drop of 6 inches it is time to change gas.
    This is all with longer barrel and stock.

    The original spring seems pretty consistent on power as well, I did not do a full string but 2 shots to start then in 2 mag steps and a couple near end on single shot tray.
    This was with 14.4grain Wasps Purple and Silencer/Moderator fitted as it produces a few more fps than without.

    Shot fps ftlb
    1 507 8.24
    2 510 8.33
    15 531 9.02
    16 528 8.91
    29 532 9.05
    30 527 8.9

    36 518 8.6

    forgot to do at 40 but POI drops an inch a few more shots and done.

    Happy with it as it is now, can only get better with even warmer weather.

    ped I gather Cheesebook is code for social network rubbish I have never used.
    If need him I will get my brother to contact.
     
    Last edited: Apr 5, 2020
    ped, shadowryder and Nubble like this.
  6. Halinfax

    Halinfax Full time tinkerer and general all round nice guy

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    Nubs... and EXCELLENT write up... well done Sir....:claping::claping::claping:
     
    Nubble likes this.
  7. Nubble

    Nubble Donator

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    Many thanks indeed.
    :)
     
  8. Wild Bill

    Wild Bill co2 Firearm Enthusiast & FX Wildcat owner.

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    Yes an excellent bit of work from @Nubble :up:
    It will come in handy when I get my CP2.
     
    Del-Dredd and Nubble like this.
  9. Nubble

    Nubble Donator

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    Thank you Bill. ;)
    Hope the end cap don't put up too much of a tussle, they can be a bit 'tight'.
    Cheers
    Nubble.
    :thumb:
     
    Del-Dredd likes this.
  10. Halinfax

    Halinfax Full time tinkerer and general all round nice guy

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    Nubble.. I sent you a PM.. hope you don't mind.. Thanks.
     
    Nubble likes this.
  11. Nubble

    Nubble Donator

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    No problem at all....
    Replied.
    :thumb:
     
  12. Del-Dredd

    Del-Dredd Engaging Member

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    Location:
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    I would say a bit tight was an understatement on mine, tube bits out and Mallet with a steel tube got it out though. All following Nubble's guide here, great piece of work.
    How they got it in there in the first place I don't know, hydraulic jack or big hammer.
    Light sanding and it fits like a glove now, easier to remove when needed.

    Deyrick
     
  13. Nubble

    Nubble Donator

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    :laff:
    Agree with you there @Del-Dredd ;) Piece of 15mm copper pipe does the trick. Having said that mine came out as easy as 3.142 :cool:
    Maybe I was being 'economical with the truth'. :confused: They are horrible plastic things and should be binned!
    I have replaced mine with a CP1 style end cap which is ok [for the CP2] if you only wanna use it in pistol mode.
    :thumb:
     
    Del-Dredd likes this.
  14. Baldilocks

    Baldilocks Engaging Member

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    Got around to eventually fettling with the CP1 trigger today, even though I bought the @Nubble trigger kit way back in April.

    What an improvement!

    Fitted the lighter of the 2 springs, put Moly on the sear & areas of movement. Fitted the pointy grubscrew, but it's flush with the trigger, not touching the sear, so not really being used as I prefer a longer pull.

    Now very pleased with the trigger on this and am getting better grouping than I was at 10 yards with the stock setup.

    Here are some 15 yard targets done this evening, QYS domed pellets, Hawke Vantage red dot (3 MOA).

    For some reason, though, the pellets are a bit rough loading at the breech and sometimes take a few pushes to chamber, so if anyone knows what's up please tell. I'm guessing it's a burr or I've tightened the 3 barrel grubs unevenly?

    20200524_214520.jpg
     
    Last edited: May 24, 2020
    Nubble likes this.
  15. Nubble

    Nubble Donator

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    Nice shooting Baldilocks. Glad the trigger is improved.
    I would say you are correct in your assumption, there is more than likely a burr on the breech end of the barrel that is affecting your loading.


    THIS MAY HELP.

    Cheers
    Nubble.
    :thumb:
     
    Baldilocks likes this.
  16. Baldilocks

    Baldilocks Engaging Member

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    Thanks for the link Nubble.

    I'll undo the 3 grubscrews tomorrow, remove the barrel, and inspect the end of it.

    I notice there are a couple of O-ring seals on the barrel of these in between the grubscrews; do you know the part number for these or if there are any aftermarket replacements?

    They look like they could be easily nicked or damaged, hence me asking.
     
    Nubble likes this.
  17. Arrizabalaga

    Arrizabalaga Forum Poet

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    Excuse me for buting in, but drop @ped a PM. He sold me a full seal kit at about half the price of Bagnal an Kirkwood a couple of weeks ago, quick delivery too.
     
    Nubble, Baldilocks and Halinfax like this.
  18. Halinfax

    Halinfax Full time tinkerer and general all round nice guy

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    Baldilocks... get a seal kit of @ped on this forum..... He will sort you out.

    I polished the front lead in edge on my PR.. BUT... DO NOT GO BEZERK... otherwise you loose the fit on the barrel face O ring. Some folk have gone overboard and lost the seal from the O ring on the breech end of the barrel.

    I used a 1:50 4mm tapered reamer with some 800 grit emery rolled around it to ONLY DEBURR the corner of barrel diameter of the O ring recess LIGHTLY.. all your doing is taking off any possible burrs. I did this on the barrel AND on the TP hole where it breaks into the barrel, as sometimes there are burrs in the rifling that can affect the skirt on the pellets... as well as restricting the pellet ingress.

    Before..
    20190413_184611.jpg

    After
    20190413_190747.jpg
     

    Attached Files:

    ped, Nubble and Baldilocks like this.
  19. Baldilocks

    Baldilocks Engaging Member

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    Thanks for the info fellas.:thumb:

    I'll PM Ped & follow your guidance.

    The pellets I'm finding this likes best are the 4.50 QYS, and even those are hard to insert.

    I'll get the emery paper out & get onto it this afternoon when the 2nd youngest (18 month old lad) has his afternoon kip. He has sticky fingers & is a bit too inquisitive to get on with the job when he's awake. :D
     
    Nubble likes this.
  20. Halinfax

    Halinfax Full time tinkerer and general all round nice guy

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    Ok mate.. BUT.. PLEASE... DO NOT USE SUMMAT LIKE THE TAPERED BIT OF A PENCIL........ the angle is too much and you may loose the effectiveness of your breech seal.

    The FINE emery paper can be wrapped around say a cocktail stich and lightly polished... it is only 1 corner that need doing as per the photo below...
    20190413_183211 - cropped.jpg
     
    Baldilocks likes this.

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