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Technical Cp1 Stripdown Guide (cp2)

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

  1. Baldilocks

    Baldilocks Engaging Member

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    Got you Hal, cheers mate.

    Got some cocktail sticks here so it'll be a doddle & I'll be extra careful.
     
  2. Inca

    Inca Busy Member

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    Thanks for this Halinfax. I too suffer pellet stiffness (!) but it is very much pellet dependant, some slip in without drama while others need persuasion. I pulled the barrel a few weeks ago and give it a quick clean to no effect but your photos have encouraged me to do a proper job this time. Under a very good jewellers' loupe all I could see was a buildup of 'fluff' under the o-ring, there were no sharp edges at all. Running a cocktail stick in & out around the circumference confirmed this. Time will tell.

    Edit: don't you just hate autocorrect!
     
    Last edited: May 25, 2020
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  3. Halinfax

    Halinfax Full time tinkerer and general all round nice guy

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    Inca... do you find it sticking a bit when using the magazine or the single shot tray?

    I found the same problem on both my PR 900's and found that ticking out the edge on the INSIDE of the magazine assisted in the smooth slide of the pellet through the mag...

    Here is a pictorial of what I did..

    The standard mag, back and front...
    20190722_114115.jpg

    Undo the screw on the front face and dis assemble fully
    20190722_114211.jpg

    Here the edge of the pellet hole is sharp, this is the edge to de-burr and polish
    20190722_114457.jpg

    I used a diamond coated dremmel bit for this on a slow speed so that you can control it better,
    20190722_114512.jpg

    Chamfe/polish ONLY the sharp inner corners of the hole
    20190722_114635.jpg

    Should look like this when done...
    20190722_115209.jpg

    Clean everything out throroughly
    20190722_115550.jpg

    Locate the load spring
    20190722_115628.jpg

    Locate the inner section and rotate it I turn to apply pre load on the spring then locate into the groove/slot
    20190722_115726(0).jpg

    With everything in place, slide the plastic cover over the oiter and inner parts (to keep then in the magazine, then replace the central screw... NOTE... there is a tiny M3 grub screw in the underside of the hole where the screw fits... this can be adjusted so that you can fasten the screw securely and it should not work loose..
    20190722_120133.jpg

    You should notice the pellet loading a little smoother....

    Hope this helps...:thumb::thumb:

    Stay safe out there....
     
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  4. Inca

    Inca Busy Member

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    That'll be very useful to mag users but I’m very much a single shot fella but non the less a very informative write-up, thank you. Quite why I bought the “-m” version of the CP1 I’ll never know:facepalm:. I haven’t had a play since this mornings fiddle but when I do, it’ll be 60 shots, I’ll try a selection of pellets and see how it behaves & what is sticky and report back. I also use a single shot magazine on my HW100 and my pcp target pistol only comes in single shot. There was a thread here months ago on the merits of single verses magazine and the consensus was that single is the more accurate. Nothing about the mag loading more your mental state, totally agree.
     
    Nubble likes this.
  5. Baldilocks

    Baldilocks Engaging Member

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    Ever had one of those days in which everything seems to go wrong? Well, today was one of those days @Halinfax

    I got around to removing the burrs on the lead in, but after removing them, there was still difficulty clambering pellets.

    At this point, I set about filing down the TP area in the barrel using 60 grit emery paper, finishing at 150 grit wrapped around a 3mm drill bit so it fit snug.

    After removing all burrs from the lead in and TP area, I still noticed a tiny bit of resistance at the latter end of pushing the probe - around 5mm. This part engages the rifling, so I guess this is normal.

    I knew the last 5mm of probe engages the pellet in the rifling, as I removed the pellet from the barrel at this point by pushing a slim carbon rod down from the muzzle to the breech & inspected the pellet. The head had the beginning of rifling marks on them.

    What should've been probably a 10 minute job took me about 2 hours as I was being gentle.

    Anyway, managed to destroy both barrel seals so now need 2 as this is now out of commission.

    Before, to insert the pellet, I had to make awkward back & forth, back & forth movements to seat the pellet - but now, seating the pellet is only the slightest of resistance right at the end - and this is where the head engages the rifling.

    Here is the before & after.

    20200525_222357.jpg 20200525_222317.jpg 20200525_222209.jpg 20200525_222142.jpg
     
    Last edited: May 25, 2020
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  6. Halinfax

    Halinfax Full time tinkerer and general all round nice guy

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    Hell's teeth.. 60 grit..... And 120 grit.... Bloody hell mate that's rough.. far too rough.... 400 grade as a first then 800 with a touch of wd40 or summat to finish to a smoother polished finish...

    The 1:50 tapered reamer I have along with some 800 fit emery is perfect for just literally tickling the very beginning of the rifling in the breech....

    However.... If you have done it and the pellet seats nicely well done.

    PS.... I would yes some scotchbrite pad on the breech and seal face.. given it a good clean up mate before re- assembly... Just saying...
     
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  7. Baldilocks

    Baldilocks Engaging Member

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    I initially started with 400 grit, but I wasn't getting anywhere with it even after about 30 mins of fettling. After that, I used the rougher emery paper.

    The emery paper I bought from the bay of e was terrible and fell to bits really quickly, so I should've bought some better stuff.

    I've sent Ped a message for some seals, but he's not been online since Thursday so I hope he's OK. I see him on here regularly.

    I'll clean up that breech seal part as you suggested mate. Good call. :thumb:
     
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  8. Halinfax

    Halinfax Full time tinkerer and general all round nice guy

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    :facepalm::facepalm: Had I have known I would have sent you some...!!!
     
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  9. Nubble

    Nubble Donator

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    Likewise.
    :thumb:
     
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  10. ped

    ped Keyboard Hero

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    been fishing since Fri but now replied to your pm mate
     
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  11. Nubble

    Nubble Donator

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    @Baldilocks
    What did I tell you! :D

    Hope you had a good time Ped.
    :thumb:
     
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  12. ped

    ped Keyboard Hero

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    a good get away but got mullered by bity bugs
     
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  13. The Pie Man

    The Pie Man “Disabled Shooter”

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    @Nubble
    thanks for this post I Finally got through it:thumb:
    I love pictures that describe what’s happening :cool:
     
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  14. Nubble

    Nubble Donator

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    Brilliant. Thank you!
    Glad it helped.
    :thumb:
     
  15. The Pie Man

    The Pie Man “Disabled Shooter”

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    Where do you get nice short silencer from.?:D
     
  16. Baldilocks

    Baldilocks Engaging Member

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    @Halinfax is the man.

    I got mine from him, & I believe Nubble did.

    He's a good guy & produces some quality gear.

    Here's mine from Halinfax & it's whisper quiet; so quiet it's difficult to tell when the Co2 is getting low. :D

    20200502_143201.jpg
     
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  17. Baldilocks

    Baldilocks Engaging Member

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    Just a quick heads up, Hal.

    The seals arrived from Ped, so fitted them yesterday.

    Results over the chrono are consistent with the extreme spread being only 12fps over the first 10 shots; average ME was 4.89 ft/ib, 510 FPS, using 8.48g QYS domed pellets.

    This is the grouping I'm getting at 11 metres rested with a Hawke Vantage red dot (3 MOA).

    Grouping since de-burring the lead in has improved by around ~6mm, so a definite improvement. Discounting the flyer, the groups are just over 1/2".

    I'm thinking of fitting a long eye relief scope, so grouping would improve further with this fitted.

    20200603_120826.jpg 20200603_120939.jpg
     
    Halinfax likes this.
  18. Halinfax

    Halinfax Full time tinkerer and general all round nice guy

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    Heyup mate.... well its a start so well done....

    Possibly a check of the muzzle crown and see what it looks like..... as you say a better scope... and just getting used to the set up... and you will be fine...

    I think that the more lead that goes through the barrel may also help...

    keep us informed...:thumb::thumb::thumb::thumb:
     
    Baldilocks likes this.
  19. The Pie Man

    The Pie Man “Disabled Shooter”

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    Just sent him pm :D
     
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  20. The Pie Man

    The Pie Man “Disabled Shooter”

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    @Nubble thanks for all your help and this write up.:)
    I started with 600 grit then 800 and then 1200 grit followed by my dremel with polishing cloth.
    My trigger is spot on without being a two stage but I’m happy .
    0C832C6E-3523-498D-A2BC-C8AB762FF181.jpeg
    9A0D307D-1DCD-42FA-A4F0-DF1E75153F63.jpeg
    Regards Harv:D
     
    Last edited: Jun 7, 2020
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