397 barrel and pump tube unsoldered and seperated

397 barrel and pump tube unsoldered and seperated

Joined: March 1st, 2002, 12:22 am

February 2nd, 2011, 7:48 am #1


Sorry for the delay....

I had not intention of actually unsoldering the two, but an impromptu experiment of which is stronger, epoxy or solder (epoxy this time) left me with a partially removed barrel and bent breech/reciever. So in the interest of science and advancing the cause of airgunning, I finished what I started some time back and unsoldered the breech/barrel from the pump tube

<img border="0" alt="Photobucket" src="http://img.photobucket.com/albums/v301/ ... rrel-1.jpg">

 </a>"><a href="http://smg.photobucket.com/albums/v301/ ... rrel-3.jpg" rel="nofollow"><img border="0" alt="Photobucket" src="http://img.photobucket.com/albums/v301/ ... rrel-3.jpg">

Please note the barrel to breech connection, the short bit of tube soldered in, and how the breech is curved to fit "flush on the pump tube.

I'm also guessing that they may have used solder paste, instead of soldering it like a plumbing joint.

I'm thinking a riser plate(3/16 or 1/4) between the two... could still use Phil's idea of a 22xx barrel he described earlier. Or maybe just use the stock barrel, cut it down some to allow shroun internals.....A barrel band or two is definitely in order.

The only gotchas adding a riser plate that leap to my subzero addled brain is the change in cocking pin geometry and the added dead space that must be filled by the aircharge to drive the pel down the barrel. Another thing may be how adding the riser and a shroud will change sight/scope mounting options

 


dr_subsonic's pneumatic research lab
<img alt="[linked image]" src="http://img.photobucket.com/albums/v301/ ... akeskn.jpg">
the Lunatic Fringe of American Airgunning
Southwest Montana's headquarters for Airgunning Supremecy
Last edited by dan_house on February 2nd, 2011, 7:57 am, edited 1 time in total.
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Joined: October 3rd, 2010, 3:22 pm

February 2nd, 2011, 4:33 pm #2

Is the barrel/breech soldered to the tube along it's entire length or are they spot soldered in a few places.

Just wondering, as I have a non-functional 397 in my do-something-with-someday pile.

-Jim
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Joined: March 1st, 2002, 12:22 am

February 2nd, 2011, 5:33 pm #3

but I had ripped it off down to the breech pulling the first shroud off. 

dr_subsonic's pneumatic research lab

the Lunatic Fringe of American Airgunning
Southwest Montana's headquarters for Airgunning Supremecy
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Joined: December 18th, 2005, 7:20 pm

February 3rd, 2011, 12:02 pm #4

Sorry for the delay....

I had not intention of actually unsoldering the two, but an impromptu experiment of which is stronger, epoxy or solder (epoxy this time) left me with a partially removed barrel and bent breech/reciever. So in the interest of science and advancing the cause of airgunning, I finished what I started some time back and unsoldered the breech/barrel from the pump tube

<img border="0" alt="Photobucket" src="http://img.photobucket.com/albums/v301/ ... rrel-1.jpg">

 </a>"><a href="http://smg.photobucket.com/albums/v301/ ... rrel-3.jpg" rel="nofollow"><img border="0" alt="Photobucket" src="http://img.photobucket.com/albums/v301/ ... rrel-3.jpg">

Please note the barrel to breech connection, the short bit of tube soldered in, and how the breech is curved to fit "flush on the pump tube.

I'm also guessing that they may have used solder paste, instead of soldering it like a plumbing joint.

I'm thinking a riser plate(3/16 or 1/4) between the two... could still use Phil's idea of a 22xx barrel he described earlier. Or maybe just use the stock barrel, cut it down some to allow shroun internals.....A barrel band or two is definitely in order.

The only gotchas adding a riser plate that leap to my subzero addled brain is the change in cocking pin geometry and the added dead space that must be filled by the aircharge to drive the pel down the barrel. Another thing may be how adding the riser and a shroud will change sight/scope mounting options

 


dr_subsonic's pneumatic research lab
<img alt="[linked image]" src="http://img.photobucket.com/albums/v301/ ... akeskn.jpg">
the Lunatic Fringe of American Airgunning
Southwest Montana's headquarters for Airgunning Supremecy
Hi, I have done a few of these ( Off barrel jobs )
Pics-[/IMG]

A .22 Setra barrel on a pre-charged Sheridan I made
Pic-[/IMG]

Now the soldering is simple !!
It was a good call to use solder paste , However , The problem is that the Inlet/Exhaust valve body is also soldered in ? & the solder which retains this can & Does run into the threads which hold the exhaust valve assy,When the barrel is being attached.

PS, Lead melts at 327C & Tin at 232 C ( If memory serves )& Thats what I use, Cheers Ged.
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