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All Springer/NP/PCP Air Gun Discussion General > Show Off Your Air Guns With Mods (SHOW and TELL)

fl(air) gun - big bore air pistol conversion

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jackssmirkingrevenge:

--- Quote from: Rob M on January 18, 2023, 11:57:26 AM ---a long version will be interesting also.
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For legal reasons it has to stay below 500 fps so unfortunately I probably won't be pushing it to its limits in terms of barrel length.


--- Quote from: Back_Roads on January 18, 2023, 12:03:12 PM ---some good energy from a plastic gun
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I love the SPAS-12 looks, interesting candidate for a bit of an upgrade.  I'm guessing it works like the APS shotguns, a mechanism similar to the old Nelson paintball markers:




--- Quote from: Rob M on January 18, 2023, 01:39:53 PM ---question , is the exhausted air expelled past the firing valve stem?
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I'm not sure I understand, there is no firing valve per se so it's not an exhaust valve.  The piston is held in place mechanically by the steel balls, and that part of the mechanism is sealed off from the chamber.

Hoosier Daddy:
Very interesting!
For quite some time I have been contemplating the Umarex T4E HDS Shotgun .68 to play with here on the forum.
It is CO2 powered and there are  projectiles and molds for this that I believe would be allowed here.

Back_Roads:

--- Quote from: Hoosier Daddy on January 18, 2023, 06:41:34 PM ---Very interesting!
For quite some time I have been contemplating the Umarex T4E HDS Shotgun .68 to play with here on the forum.
It is CO2 powered and there are  projectiles and molds for this that I believe would be allowed here.




--- End quote ---

 I would love to go all Elmer Fudd on a wabbit in da gawden wifth that for swure. :)

Rob M:
Jack , I looked at the diagram again , and im likely missing something.. There are 2 major moving parts, the large spool or piston up front , thats releasing air into the barrel. The smaller part at the rear that is the firing pin , when that is struck , whats causing the large " spool " to retract rearward ? I assumed it was a pressure imbalance where the air at the rear is vented from the gun,, Perhaps its not

jackssmirkingrevenge:
I tried to explain it in the video:



This is the crucial part:



The piston is slightly unbalanced and naturally wants to retract, but it's the locking balls (yellow) keeping it in place.

When the flare gun firing pin hits the purple pin, the locking balls are no longer supported and there is nothing preventing the piston from moving, so it can retract and dump the chamber.

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