Valve mod - pcp pistol

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   First bit of progress here for a while.
I have made a start on what I call the cocking plate. This is part of the bolt lockup very similar to what I have done on another build.

Bolt will be straight pull, but be spring loaded and will lock into and locate into place being held captive when loaded.

It just a piece of mild steel, but I squared it up in the mill and countersunk the 4 screws that will hold it in place.

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Pauly5 Members Profile Send Private Message Find Members Posts Add to Buddy List Forum Moderator Joined: 11 Mar 2013 Location: Titahi Bay Status: Offline Posts: 1676	Post Options Post Reply Quote Pauly5 Report Post Thanks(0) Quote Reply Posted: 09 Feb 2025 at 1:47pm
	First bit of progress here for a while. I have made a start on what I call the cocking plate. This is part of the bolt lockup very similar to what I have done on another build. Bolt will be straight pull, but be spring loaded and will lock into and locate into place being held captive when loaded. It just a piece of mild steel, but I squared it up in the mill and countersunk the 4 screws that will hold it in place.

RangerPete Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 19 Apr 2023 Location: Cambridge. Status: Offline Posts: 1035	Post Options Post Reply Quote RangerPete Report Post Thanks(0) Quote Reply Posted: 09 Feb 2025 at 2:14pm
	Looking good, cant wait to see it when its all finished.
	Walk quietly, but carry a big stick.

Pauly5 Members Profile Send Private Message Find Members Posts Add to Buddy List Forum Moderator Joined: 11 Mar 2013 Location: Titahi Bay Status: Offline Posts: 1676	Post Options Post Reply Quote Pauly5 Report Post Thanks(0) Quote Reply Posted: 11 Mar 2025 at 9:06pm
	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

jwabfrog Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 13 Nov 2021 Location: Thames Status: Offline Posts: 159	Post Options Post Reply Quote jwabfrog Report Post Thanks(0) Quote Reply Posted: 12 Mar 2025 at 11:42am
	Very cool Paul, you are a talented engineer!

J-S Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Senior Member Joined: 20 Oct 2014 Location: Auckland Status: Offline Posts: 497	Post Options Post Reply Quote J-S Report Post Thanks(0) Quote Reply Posted: 12 Mar 2025 at 12:24pm
	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..

Pauly5 Members Profile Send Private Message Find Members Posts Add to Buddy List Forum Moderator Joined: 11 Mar 2013 Location: Titahi Bay Status: Offline Posts: 1676	Post Options Post Reply Quote Pauly5 Report Post Thanks(0) Quote Reply Posted: 29 Jun 2025 at 11:27pm
	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.

RangerPete Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 19 Apr 2023 Location: Cambridge. Status: Offline Posts: 1035	Post Options Post Reply Quote RangerPete Report Post Thanks(0) Quote Reply Posted: 30 Jun 2025 at 5:22pm
	Exciting progress, keep us posted.
	Walk quietly, but carry a big stick.

Pauly5 Members Profile Send Private Message Find Members Posts Add to Buddy List Forum Moderator Joined: 11 Mar 2013 Location: Titahi Bay Status: Offline Posts: 1676	Post Options Post Reply Quote Pauly5 Report Post Thanks(1) Quote Reply Posted: 10 Jul 2025 at 9:35pm
	https://imgur.com/a/JpHT1RM

Pauly5 Members Profile Send Private Message Find Members Posts Add to Buddy List Forum Moderator Joined: 11 Mar 2013 Location: Titahi Bay Status: Offline Posts: 1676	Post Options Post Reply Quote Pauly5 Report Post Thanks(0) Quote Reply Posted: 10 Jul 2025 at 9:41pm
	I have tried uploading this photo following Grey Kiwi's workaround.

Pauly5 Members Profile Send Private Message Find Members Posts Add to Buddy List Forum Moderator Joined: 11 Mar 2013 Location: Titahi Bay Status: Offline Posts: 1676	Post Options Post Reply Quote Pauly5 Report Post Thanks(0) Quote Reply Posted: 09 Oct 2025 at 7:26am
	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.

kruzaroad Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 03 Jul 2022 Location: Hastings 4 now Status: Offline Posts: 2692	Post Options Post Reply Quote kruzaroad Report Post Thanks(0) Quote Reply Posted: 09 Oct 2025 at 7:45am
	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?

Pauly5 Members Profile Send Private Message Find Members Posts Add to Buddy List Forum Moderator Joined: 11 Mar 2013 Location: Titahi Bay Status: Offline Posts: 1676	Post Options Post Reply Quote Pauly5 Report Post Thanks(0) Quote Reply Posted: 09 Oct 2025 at 9:09am
	Yes, wood is involved. I just found a more recent photo with power it's achieving.

Pauly5 Members Profile Send Private Message Find Members Posts Add to Buddy List Forum Moderator Joined: 11 Mar 2013 Location: Titahi Bay Status: Offline Posts: 1676	Post Options Post Reply Quote Pauly5 Report Post Thanks(0) Quote Reply Posted: 09 Oct 2025 at 9:12am


kruzaroad Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 03 Jul 2022 Location: Hastings 4 now Status: Offline Posts: 2692	Post Options Post Reply Quote kruzaroad Report Post Thanks(0) Quote Reply Posted: 09 Oct 2025 at 10:26am
	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 👍

Pauly5 Members Profile Send Private Message Find Members Posts Add to Buddy List Forum Moderator Joined: 11 Mar 2013 Location: Titahi Bay Status: Offline Posts: 1676	Post Options Post Reply Quote Pauly5 Report Post Thanks(0) Quote Reply Posted: 09 Oct 2025 at 5:33pm
	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.