SPA CP 1&2 and the plinkster

[huklbery]

Enjoying the straight design and simplicity of these affordable guys.  Since shooting can frequently exceed 100F in the shade valve locking can take place on the CO2 stuff.  I like the HPA options for those times of the year.  While I liked the plinkster I have quite a few that already cover that zone of modest power.  That said the CP2 carbine stock suits me to a T.  Using the spare stock I'm converting it to a bottle gun and have it mocked up now.

With 800psi I'm seeing 596 with 14.3g & 1100psi it avg 733 for  17Ftlbs.  No porting aside from removing the piercing/filter from the valve. 

Anyone have any porting and or spring experience to share on these rigs? 

[avator]

Yep... they are the new "lego" guns.
Julie at SPA will send you all the parts you need for tinkering except barrels and stock.
Have fun.

[Wayne52]

With the ease of getting parts for SPA guns direct there's many possibilities with the CP2, I've thought seriously about getting me some PR900W parts to add to mine

[Rob M]

I think ive done everything under the sun with the mrodair co2 guns.. heres one example


https://www.gatewaytoairguns.org/GTA/index.php?topic=136909.0

I also made a 25 cal plinkster, a 9mm plinkster, a 9mm plinkster on hpa,and a bulk fill plinkster.. In my opinion , they are nicer to work on than the 2240 series.. The valves follow all the same rules.. lighter valve spring , slightly shorter stem , opening the throat in moderation , the transfer port and so on.

[HueAirgun]

the PR900 is basicaly a bigger CP2 with wood stock.
Take a look below

[huklbery]

"the PR900 is basicaly a bigger CP2 with wood stock. Take a look below"

I like the Dummy CO2 cartridge approach Giovanni, I did one as well for running on hpa tethered.   I saw about a 30fps gain with 1100psi so the restrictions preventing the volume on the valve side from being met I suspect is the "bottle neck" so to speak. 

The "Plinkster" (the mrod name for the CO2 version of rifle in the series) has been converted into a bottle gun with the C2 stock.  With a 1100psi regulated bottle and the filter/bulb pierce removed it's running 730fps/17ftlbs with 14.3g pellets.   

I had not intended to purchase the HPA "Varmint/Diana Stormrider" version... it would overlap/replicate several airguns on the rack.  That said if for nothing else to see/measure their changes to reach the 26ftlbs & 900fps its a strong draw to order one...

While I will always go for repeatability on shot placement, with the HPA bottle I don't have to be as air frugal and don't mind running a bit hotter even if efficiency isn't optimum.