What work did you just do?

[Gippeto]

Still playing with rust bluing. Current solution is 2 oz 3% hydrogen peroxide, 1/4 tsp white vinegar and sea salt to make a saturated solution at room temperature.

Finished the QB79, and started in on the Crosman based .32 pcp. Finished the top end and polished a few bits 'n bobs before assembling it. I'm VERY pleased with the results...pics do not do it true justice. Hoping to have the tube finished tomorrow or Monday.

Before;



Now;





Al

[crossliner]

As always very clean work Mr. G  is that a custom made breech and did you make that yourself? Looks like a Crooked Barn breech but since it's steel then I don't think it is. Best regards.

[Gippeto]

A fellow in our local airgun group provided the barrel, some ammo and the loan of a CB shot shell breech to take some measurements off. I made a few subtle changes, steel being one of them.

Gets 6 shots/1700psi fill and peaks @ 30fpe.

Good eye BTW.

Al

[1377x]

sweet!
nice work as usual!

[quickster47 †]

Gippeto that is sweet looking.  Love that fill piece on the tube.  Great idea.   

Carl

[sandpiper]

Very sweet project you have there 

[cheewee]

A fellow in our local airgun group provided the barrel, some ammo and the loan of a CB shot shell breech to take some measurements off. I made a few subtle changes, steel being one of them.

Gets 6 shots/1700psi fill and peaks @ 30fpe.

Good eye BTW.

Al

very nice work.
i am curious as to how the shotshell breeches work

[quickster47 †]

very nice work.
i am curious as to how the shotshell breeches work

Me too on the shotshell breech.  Is there any text or link on this subject or is it just something you learn along the way?

Carl

[crossliner]

I remember seeing a CB shot shell air pistol posted here about a year ago. It was very clean and decent looking..

[Gippeto]

Not too sure what you guys mean by "how it works"?

Air path?

It's a flow through bolt. The transfer port seals on the lower side of the breech, passage up to the bolt. The bolt (1/2" od) has an o-ring on either side of the transfer port. Air passes up the TP, into and through the bolt.

Bolt seals on the breech end of the barrel with a captive o-ring.

Can put up a pic or two tonight if anything is still in need of clarification.

Al

[quickster47 †]

Got it.  So it is a flow-through bolt if you will.  Why do they call it a shotshell breech?

Thanks,

Carl

[Gippeto]

The original used the shot shells from the 1100 trapmaster.

Have never spoken with the Jim about it to confirm, but I suspect that had something to do with it.

[BDS]

Ok, shot-shell explanation helps a lot

[Trophyhunter49]

 Resealed an old Crosman 2200 and started on an old 760. I think what I can find on the 760 maybe mid 80's! The rear site is groken off , but it clamped around the barrel and not screwed to it! Never seen one like that. Planing on doing a full custom on it!

[targettgii]

That's some nice work on that pistol Gippeto, and I love that breech.