Mares medisten muzle

[Voja]

Dobro vece imam problem koji ne mogu da resim, ne mogu da odvrnem originalnu njusku sa starog mares medistena, hocu da ugradim salvimar vacuum kit. Imate li kakvu preporuku kako da odvrnete staru njušku...hvala.

 

[popgun pete]

 

[Voja]

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Thank you very much popgun pete

 

[patientcrista]

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[popgun pete]

A couple of views of the muzzle spanner machined up on my lathe. The handles are large bolts turned down on the ends to engage the relief ports in the muzzle with short pins that fit into the port holes.

 

[popgun pete]

The slot in one face is a later addition for muzzles where the relief ports are very close to the nose cone entrance. In those situations an alloy pin is pushed through the ports and the spanner engages this piece of rod on its exposed ends, the rod being just long enough to poke out both sides of the muzzle. For this to work you have to depressurize the gun and push the piston back just enough to get the pin through. A gun that required this approach was the Mares Mirage which has a stubby nose cone, it having two barrels, a shooting barrel and a pumping barrel.

 

[popgun pete]

Note that the gun must be fully depressurized to remove the muzzle in any case. Otherwise the piston leaning on the shock absorber anvil will load up the muzzle screw threads making it very hard to undo and it will be very dangerous as once the muzzle threads are fully undone the muzzle and piston will fly from the gun with potentially lethal consequences.

 

[popgun pete]

The muzzle is one half of a clamp that holds the pneumatic gun together by resisting the action of high pressure air trying to blow it apart. The other end of this strong clamp is the inlet valve body. The muzzle screws onto an external thread, the inlet valve body screws into an internal thread in the inner barrel tube. Some guns use a different arrangement at the rear end, holding the inlet valve body onto the inner barrel tube using a transverse pin or pins. An example is the Technisub Grinta and Jeans rear handle guns. Another is the Soviet Prizm or RPB-1.

 

[Voja]

Popgun pete, thank you for your help, I was able to unscrew the muzzle. Can you please help me where to put this little spring valve back, it fell out of the plastic ring when I dismantled the gun?

 

[popgun pete]

That is the older type one-way valve in the power regulator bulkhead and goes in from its rear face. The valve and the rubber seat are combined in that little solid rubber cylinder. When pressure is greater in the gun’s pre-chamber, i.e. the upper handle volume, it is blown forwards against its spring and opening up to let air flow forward into the tank, but when pressure is greater in the tank than the rear prechamber it shuts off air attempting to flow rearwards from the tank.

 

[Voja]

That is the older type one-way valve in the power regulator bulkhead and goes in from its rear face. The valve and the rubber seat are combined in that little solid rubber cylinder. When pressure is greater in the gun’s pre-chamber, i.e. the upper handle volume, it is blown forwards against its spring and opening up to let air flow forward into the tank, but when pressure is greater in the tank than the rear prechamber it shuts off air attempting to flow rearwards from the tank.
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Popgun pete, thank you for the explanation and the great diagram, you helped me a lot

That is the older type one-way valve in the power regulator bulkhead and goes in from its rear face. The valve and the rubber seat are combined in that little solid rubber cylinder. When pressure is greater in the gun’s pre-chamber, i.e. the upper handle volume, it is blown forwards against its spring and opening up to let air flow forward into the tank, but when pressure is greater in the tank than the rear prechamber it shuts off air attempting to flow rearwards from the tank.
View attachment 58980
View attachment 58978

Popgun pete, thank you for the explanation and the great diagram, you helped me a lot