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Technical 100 Useable Shots Cp 1

Discussion in 'Air Pistols' started by Jeff Kay, Jun 27, 2019.

  1. Jeff Kay

    Jeff Kay Member

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    As a paper puncher the power of of my pistol just has to be enough to be accurate over ten meters. Any more than that is just wasted so l decided to improve the shot count of one of my cp 1 pistols by stripping it, dismantling the valve and simply filling the extra space around the spring with a plastic bush. The result was a useable 100 shots from one co2 capsule with 177 hobby pellets. Has anyone else tried this modification?
     
    Redcap 114 and Sanguinius like this.
  2. QuoVadis69

    QuoVadis69 Donator

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    @Nubble is my go to guy for anything CP1 so I'll wait til he chimes in.
     
    Nubble likes this.
  3. Cinimod

    Cinimod Engaging Member

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    Hi Jeff, that's a good shot count what fps are you getting? I've done a valve volume reduction washer for my crosman 1740 valve and have also taken a couple of coils off the hammer spring and get about 120 shots. Somewhere I've got a photo of the shots and fps details that I'll see if I can find...........dom
     
    Redcap 114 likes this.
  4. Cinimod

    Cinimod Engaging Member

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  5. Nubble

    Nubble Donator

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    Ding.....

    Cheers QV.
    :thumb:

    Nice modification Jeff. Deffo a good way of reducing volume inside your valve. 100 shots per bulb is good going. I have thought about sleeving the inside of my CP1 valve with something to decrease the volume in there, which in turn would increase shot count and decrease fps. Film container, plastic bottle etc. I just haven't got round to it as I'm quite happy with the way it is at the moment.

    A much simpler method and an awful lot less hassle is to just fit a much lighter hammer spring. This takes 5 mins and has no adverse affect on the function of the pistol other than lowering the output. I have found a suitable replacement that I offer for sale here on AGF which should give you at least 30% (about 35-40%) increase in shot count and around 2.8-3ft-lbs with 7.0gr Geco. I run these in all my pistols and I'm getting around 80+ shots from my CP1 before removing the capsule. This is keeping the hammer spring at the same length. If you reduce the length by a further 4-5mm you should get shed loads more. In my CP Bitsa pistol I am getting well over 200 shots per bulb which is really a little bit extreme.

    An M5 washer under the valve spring will give almost the same effect as will swapping the valve spring out for a longer/heavier version.

    Hammer spring is by far the easiest mod to increase shot count and is not as much faff as taking the pistol completely to pieces just to take the valve out.
    Reckon I could fit a hammer spring in less than 3mins.

    Dunno if any of that helps??

    Cheers
    Nubble
    :thumb:
     
  6. john harris

    john harris Engaging Member

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    I only get about 20 from my CP2 ! Duh:facepalm:
     
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  7. Nubble

    Nubble Donator

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  8. Rincewind666

    Rincewind666 Donator

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    .25???
     
  9. john harris

    john harris Engaging Member

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  10. Jeff Kay

    Jeff Kay Member

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    Pics showing the mod the plastic is from a ball point pen. A very technical way of modifying the pistol! by using a longer our shorter piece the out put can be fine tuned. Before the output was 630 Fps after it was down to 435 fps still adequate for paper targets. The hammer spring I used had lost some length though long use so I left it alone.
     
  11. Jeff Kay

    Jeff Kay Member

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    See previous post.
     

    Attached Files:

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  12. Nubble

    Nubble Donator

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    That looks like a fantastically, fantastic fit in there Jeff. Made to fit!
    Good work. I like it.
    :thumb:
     
    Jeff Kay likes this.
  13. Jeff Kay

    Jeff Kay Member

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    That’s not good definitely needs looking at, it must be wasting co2 some where.
     

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