CP2 gets a big upgrade.

[avator]

I thought I had already started a thread on this build but I couldn't find it so I guess I'll start again..
A few years ago I ended up with an SPA CP1 pistol. Some time later Mike at MRodAir came up with the stock and forearm kit to make it a carbine. Then the CP2 Master Blaster kit came out. This came with a long and short barrel and you could swap it from pistol to carbine. They were C02 guns. These SPA guns had the potential to become the next "lego" gun... IMO. And "tinker" I did.
Anyways... I was in a "tinker" mode a few weeks back and decided I wanted to convert a C02 pieces and parts pistol into a PCP pistol/carbine. I contacted our buddy WesBob up in Canada and he was happy to sell me what I needed.
The tube
The front half of the valve
The fill port, gauge and probe
And some various  rings
Recent logistic issues really slowed deliverey.. I mean, to the point that I nearly forgot I had ordered these parts.
I was out getting muddy this morning at the ATV park and called Betty Lou to check in. She told me that I got a package from Canada. Took me a minute to remember what it was.

[avator]

Well, I got home this afternoon, scraped some of the mud off and headed for the tinker bench.
I gathered up the parts I had from the butchered CP1 and some CP2 stuff and went into assembly mode.
The tube from Wes took the upgraded adjustable trigger from the CP2.... nice, I have that.
I used the left handed breech and .177 barrel from the CP1. I also had a barrel band from the CP2 that gave me a weaver on the bottom for the bipod.... or whatever... light, laser.
I put it all together and put the air to it from one of my tanks..... WHOOSH... air coming from inside the gun. Yep, ya big dummy, you forgot to put the oring between the valve halves.
Tore it back down just knowing I was going to scrape orings up on the tube threads.... but I got lucky.
Put the air tank to it and viola... aired right up.

[avator]

Oh ya, pics or it didn't happen.....

[avator]

The Nikon P-223 scope is perfect for this little critter gitter.
The LDC shuts it right up and will get a flat black coat of paint.
It got dark on me but tomorrow will get some numbers and do some fine tuning.
Then we'll fine it's favorite food and check accuracy.
The worst thing about putting these things together is finishing them...  then you start thinking about the next one... 

[Pelletjunkie]

So now you have a Bandit or PP800. I have some CP1’s, a PP800 and had a Bandit. SPA used the same hammer springs in all of them. I want to say all the TP’s were the same also. A bad/cheap decision on their part but it gives us lots of room to make the gun better. How they come out of the box a shot string looks like a tire going flat.

[avator]

Yep, zactly Frank.
The parts I got from Wes were PP880 stuff.
Tomorrow I'll get more into it... maybe more hammer spring and open that TP a bit.... we'll see once I get some numbers.
I'm happy with a 25yd accurate repeating .177 pistol carbine PCP.

[avator]

I got around 10 .177 mags. Shot count will also be what I'm after. Fill 'er up, grab a hand full of mags and head out. A buddy bottle and a pocket full of mags should give hours of fun.

[Pelletjunkie]

I’m trying to remember back when these pistols were a hot topic exactly what the main problem was. I think first off you have to be realistic with a short barreled .177 velocity. I would say sub 600fps. Then it’s dealing with too much spring and horrible hammer bounce. I believe once you get the spring under control and start to see somewhat of a bell curve, you can open the ports a little if the gun gets too slow. Some of us just wound up regulating ours. I get over 50 shots at 650fps with 7.3 pellets. My Altaros reg is set at 115b. Stock porting and a HDD.

[avator]

IIRC.. the issue was hard pellet loading and the breech bolt would snap off.
I dressed the leade for smoother pellet loading and I always close the bolt with my thumb on the back of it.
This one cycles pretty good.... no hang ups.

[avator]

I have a bunch of JSB 8.4 that I'm hoping work well.
Other than that, I got a boatload of .177 pellets to work with.

[Pelletjunkie]

Yeah the leade in those guns were pellet shredders. With that ironed out you can focus on air management. Have fun and good luck.

[avator]

TY Sir.
Fun is what it's all about.

[Bob Pratl]

TY Sir.
Fun is what it's all about.

Bill, very interesting. Do you have the part numbers for all of the PP800 parts needed for this conversion?
Will these parts also fit the CP1's?

[avator]

Hey Bob... thanks for showing interest.
Yeah, I just looked and Wes didn't send me a packing list or I have lost it...
Couple things...
First, I didn't order from a list. I called Wes and told him what I wanted to do. We talked about it and decided what I needed by part name and description. He gave me a price and I sent the money.
Secondly, I was left with the impression that these parts came from a stock PP800 so, he would need to order parts from China to replace them. I'm not sure how willing he is to do that continuously. You'll just want to call and speak to him. He's a great guy. Very "Mike Mellick" like only way younger... lol
As for the CP1...
The only issue there is the trigger group. The pin placement is different from the CP1 tube and the PP800 tube. You'll need the CP2 or the PP800 trigger parts. Everything else is interchangeable. My gun is a mix and match of all 3. Matter of fact, the front half of the valve is PP800 and the back half and guts are CP1.
As a courtesy to Wes, I'm not going to post what I paid. Like I said, these parts are not listed on his site for sale. However, I'm sure you can find the PP800 parts diagram and order the parts from China (or call Wes and get the part numbers). Shipping is slow and expensive from China.
Hope this helps... all questions are welcome.

[avator]

Ok, I went back in this morning...
The gun graciously held air all night... YAY !!
After processing the build overnight I couldn't help feeling like I may have scraped the barrel orings when I put the barrel back in the breech. I took it back apart and replaced them and was mindful of the TP alignment.
Next, that LDC is a tad oversized and I was afraid that poor alignment would result in pellet clipping. So, I cut a piece of blister pack plastic and made a round shim (insert). That worked great.

[avator]

I ran a mag and I'm getting hammer bounce. Not real bad but enough to address it.
After breakfast I'm gonna tinker with hammer spring. Might even look at a Bstaley oring mod. The poppet stem is way short so I'm not sure if it can be done.... maybe just one oring.
I have a butt load of springs to choose from.
Not going to open up the TP ports at this point.... lemme get some numbers first. Good news is, at some point I bought a sack of spare SPA parts from someone. Mainly valve parts and a couple TP ports. Just in case I go too big.... 

[avator]

Hold up.... I smell blueberry pancakes coming from the kitchen !!

[Back_Roads]

 Cool outcome Bill. I thought when these guns came out there would be alot more Legoing going on with them, Seems to have fizzled out, and Crosman still the Leggo king, though FX became the high end Legos.
 I have the .25 900, Diana chaser .22, and the PP750 .22 in my assortment, along with the .22 Dragonfly Pumper.

[avator]

I was all fired up on that Dragonfly when SPA announced it but, my desire for it fizzled as the wait time grew.

[avator]

Well, I did a bit of a shade tree mod to eliminate hammer bounce.
And remember kids, you CAN try this at home... 
I pulled the hammer spring out and dropped one oring down in the hammer. On top of that I dropped in a delrin (?) seal from a bleeder valve (spare from a compressor). Then the spring and finally the spring guide. Not sure which end of the spring the guide went it from factory but my sense tells me that the hammer would guide the spring at the hammer end. We would want the spring to have support outside of the hammer. At least that's the way it is with springer guns.

I have rounded up 6 mags. If my gozindas are right, I can shoot all 54 shots on a fill..... we'll see. You math heads can figure volume times pressure divided by shot count if you want. I have better ways to induce brain pain.
Either way, I like what I am seeing and I don't think numbers (when I get them) are going to make me want to change anything. It will most likely be what it is.

Sight in time.