Other 78G

[jccams]

Does anyone know what size the o-ring is that seals the piercing pin?

 

[marflow 777]

006

 

[jccams]

006

Thank-you

 

[jccams]

006

Any certain durometer?

 

[Septicdeath]

I just use the ones from home depot

 

[marflow 777]

first off, the proper Oring material should be Urethane
now if it is 70 or 90 dura it should not matter
now you can use any material you want but urethane is the correct material and that might be harder to find at some hardware stores

 

[jccams]

first off, the proper Oring material should be Urethane
now if it is 70 or 90 dura it should not matter
now you can use any material you want but urethane is the correct material and that might be harder to find at some hardware stores

That's what I was wondering about. May have to get whatever they have at the hardware to see if it stops the leak and look around for a Urethane. I was thinking of sending it out to Phil, but if it holds air I may shoot it some. What should this shoot for fps if it's healthy? I was seeing 370 with 14.3's. No idea where the power is set or how much that changes it. Doesn't look like it was ever adjusted.

 

[78gCollector]

That's what I was wondering about. May have to get whatever they have at the hardware to see if it stops the leak and look around for a Urethane. I was thinking of sending it out to Phil, but if it holds air I may shoot it some. What should this shoot for fps if it's healthy? I was seeing 370 with 14.3's. No idea where the power is set or how much that changes it. Doesn't look like it was ever adjusted.

That muzzle velocity is consistent for a 78g in original configuration. I've run a few of my 78gs across a chrono, and the ones with rebuilt original exhaust valves were 355-370 fps. Those with the white replacement valves were 405-415 fps average. The service manual lists 320 fps as the factory minimum velocity for the first 20 shots from a new CO2 cartridge.

 

[jccams]

That muzzle velocity is consistent for a 78g in original configuration. I've run a few of my 78gs across a chrono, and the ones with rebuilt original exhaust valves were 355-370 fps. Those with the white replacement valves were 405-415 fps average. The service manual lists 320 fps as the factory minimum velocity for the first 20 shots from a new CO2 cartridge.

Thank-you sir.