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 Post subject: 12 gauge pcp idea
PostPosted: Thu Apr 24, 2014 5:03 pm 
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Location: Central West River Nova Scotia
Anybody ever considered building a pcp gun using a shotgun. The barrel would make a great tube. A pinned end filler cap, a tp, modify the hammer/firing pin, then mount a breech and barrel and bob, s yer uncle.

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 Post subject: Re: 12 gauge pcp idea
PostPosted: Thu Apr 24, 2014 5:09 pm 
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https://www.youtube.com/watch?v=ODHPmmqEGCU
edit: kinda jumped on that one having recently seen the trapmaster and it top of mind.
Having read the post properly to mean using shotgun bore as charge tube, could result in a bit of an airgun sleeper.
Old break action double 12s could double charge and offer a spot for a centered barrel.
Maybe tweak valving to allow for half or full power via existing trigger(s).
Pinned caps at muzzle and hammer actuated valving on the back end routing hpa to a centered airgun barrel via space previously used for ejector.
Single shot using existing action for load and lock.


Last edited by blarg on Thu Apr 24, 2014 5:25 pm, edited 1 time in total.

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 Post subject: Re: 12 gauge pcp idea
PostPosted: Thu Apr 24, 2014 5:12 pm 
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blarg wrote:

I dont mean a pcp shotgun. I mean a pellet gun made from a shotgun.

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 Post subject: Re: 12 gauge pcp idea
PostPosted: Thu Apr 24, 2014 5:19 pm 
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you mean like the Air Arms S510 TC (Twin Cylinder) rifle
use the shotgun barrels and use it as Twin Cylinder ?

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 Post subject: Re: 12 gauge pcp idea
PostPosted: Thu Apr 24, 2014 5:49 pm 
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blarg wrote:
https://www.youtube.com/watch?v=ODHPmmqEGCU
edit: kinda jumped on that one having recently seen the trapmaster and it top of mind.
Having read the post properly to mean using shotgun bore as charge tube, could result in a bit of an airgun sleeper.
Old break action double 12s could double charge and offer a spot for a centered barrel.
Maybe tweak valving to allow for half or full power via existing trigger(s).
Pinned caps at muzzle and hammer actuated valving on the back end routing hpa to a centered airgun barrel via space previously used for ejector.
Single shot using existing action for load and lock.

yea, you, ve, got the idea.

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 Post subject: Re: 12 gauge pcp idea
PostPosted: Thu Apr 24, 2014 5:52 pm 
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Seem, s a double barrel would be more of a challenge. Linking both tubes for one transfer port and two filler cap, s.

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 Post subject: Re: 12 gauge pcp idea
PostPosted: Thu Apr 24, 2014 6:21 pm 
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Look at this Joe.
Impossible to get here tho
http://www.armasshark.com.ar/7.html

Alex

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 Post subject: Re: 12 gauge pcp idea
PostPosted: Thu Apr 24, 2014 6:24 pm 
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Oh! my mistake Joe i was thinking something ells.

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 Post subject: Re: 12 gauge pcp idea
PostPosted: Thu Apr 24, 2014 7:03 pm 
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joe hickey wrote:
Seem, s a double barrel would be more of a challenge. Linking both tubes for one transfer port and two filler cap, s.


Well, any build is a challenge if it's new. Threads for choke tubes could provide fastening for caps to keep it clean.
Independent tube pressures may be more than is necessary, but would vary the flexibility.
The Ejector area should provide sufficient room for clocked valves to dump into a common exhaust plenum:
ImageImage

And the airgun barrel could be sealed a la break barrel airgun using original gun action or a simple falling block for loading top airgun barrel.
Use hammer weighting for tune.
The only really new bit would be engineering that common plenum. A couple angled holes inside old bore, pointing upward to the common joint (which could be milled to radius of airgun barrel) between pressure tubes. Vertical transfer tube drilled to where they meet and rear valves pinned with flush bolts under action, on the lower side and the top (where it could double as mount point for airgun rear barrel band/block) and job done.
A pumper valve is under the ID of a 12Ga bore, but really only the poppet end is needed as the entire bore becomes the valve right?

Certainly no worries about pressure.


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 Post subject: Re: 12 gauge pcp idea
PostPosted: Thu Apr 24, 2014 9:36 pm 
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I like the idea of using one barrel for the air tube and hiding the air rifle barrel inside the other shotgun barrel, so you'd keep the appearance of the original. Might be tricky to build though.


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 Post subject: Re: 12 gauge pcp idea
PostPosted: Fri Apr 25, 2014 1:03 am 
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Location: California USA
Why not do it Dreiling style? SxS shotgun tubes with a pellet barrel centered under.


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 Post subject: Re: 12 gauge pcp idea
PostPosted: Fri Apr 25, 2014 1:46 am 
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Big Bore Bart wrote:
Why not do it Dreiling style? SxS shotgun tubes with a pellet barrel centered under.

You mean "Drilling" Bart?

I had a real nice Merkel that was a three barrel/Drilling gun/shotgun.

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 Post subject: Re: 12 gauge pcp idea
PostPosted: Fri Apr 25, 2014 3:12 am 
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Dreiling:
Image
This was my thought only above for sake of loading.
Wishing I had a lathe...


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 Post subject: Re: 12 gauge pcp idea
PostPosted: Fri Apr 25, 2014 10:03 am 
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Location: Coalmont BC
Anything is possible....

Bob

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 Post subject: Re: 12 gauge pcp idea
PostPosted: Fri Apr 25, 2014 11:22 am 
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You all just reminded me of Pavlov's drool post about his homemade guns and his shot gun...
http://www.airgunforum.ca/forums/topic15957-255.html

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