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Valve mod - pcp pistol
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Pauly5 View Drop Down
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    Posted: 10 Oct 2025 at 7:32am
yes. ive mounted the red dot directly. i made the dove tail plate, but didnt use it.
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A stock is going to give you a a better performance evaluation of the gun just on stability alone.
Do preformance with a stock for evaluation of gun then put back to pistol and test.
Is the dove tail removable?
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Pauly5 View Drop Down
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Thanks Kruz, I get enjoyment from firing it. I'd love to try it on rabbits, but need more practice with a pistol. I coulkd put the stock on it maybe.
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kruzaroad View Drop Down
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That holds energy down range for quite a while.
Even with a shorter barrel im guessing it will have effective range.
Goats not out of question either. Nice
Wood adds to it nicely.
You must be pretty stoked 👍
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Pauly5 View Drop Down
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Pauly5 View Drop Down
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Yes, wood is involved. I just found a more recent photo with power it's achieving.
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kruzaroad View Drop Down
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I like that.
That breech how heavy is it? I rather like the ability to access it and if that dove tail plate is removable? That allows the possibility of bolt on picatiny, weaver, special made plates for say a ghost ring,peep sights etc.
Why dont you band the barrel? Is the barrel pretty thick?
Me personally find the band on crosman helps with accuracy, when i tried it off it widened the group a good inch.
Its a nice looking pistol paul. I like the rawness of the build.
Looks practical and accessable,solid.
Got any plans for wood or color?
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Pauly5 View Drop Down
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Now we can post photos again I have a more recent photo of my 25 cal pistol build.

It's pretty much finished, holding air and lobbing those big pellets. I still have to see how accurate it is, but at around 12 m it grouped well without trying too hard.
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Pauly5 View Drop Down
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I have tried uploading this photo following Grey Kiwi's workaround.
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Pauly5 View Drop Down
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https://imgur.com/a/JpHT1RM
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Exciting progress, keep us posted.
Walk quietly, but carry a big stick.
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Pauly5 View Drop Down
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I have been chipping away on this pistol and I am pretty close to completion. I have tried making 3D printed cosmetic additions, but they aren't quite right. Of course I would show photo's, but don't know if we have that sorted yet.

But, I did beef up the hammer length by adding an adjustable striking surface. I filled it to around 1500 psi and it pushed a 25 grn pellet at 706 fps, which equates to just over 28 ft/lb. I don't think I will get many usable shots at that, but I am really pleased with that as a result, as it means I have made the valve breath well enough to do that.

I have a small red dot to mount on it now and accuracy testing to come next.

I will load photos when I can.
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That’s awesome.
J S Airguns
Air Arms TX200('s)
Theoben Sirocco
HW77
FWB 300s
Webley Patriot
One or two others...

Current projects:
Too many..
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Very cool Paul, you are a talented engineer!
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Pauly5 View Drop Down
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very firable now. I have completed the cocking lockup mechanism now and it's shooting really well.

I fired about 6 shots over the chrony and got a fairly consistant 21 - 22 fpe from a 26 grn pellet. Next I am looking for a compact red dot/holograph sight for it. I won't make rails, but will attach the sight directly to the breech.

Here's a link to a short video.  https://youtube.com/shorts/naeNdHIvOVo?si=UgD87Ts6zoEL3e7s
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