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MadMax · November 14th, 2008, 04:47

Try this test with an empty mag and a cocked hammer (mag in the gun).

1. pull trigger and hold the trigger down
2. pull upwards on the slide and pull it back
3. keep applying upwards pull to the slide and push the mag down onto a fill tip on your propane adaptor (difficult, but I'm trying to check something in particular)

If gas flows out of the mag with the slide fully racked and pulled upwards, then your firing pin disconnector tab has not been pushed fully down so it disconnects the the firing pin and lets the mag valve close. The mag valve in your GBB is held open for the first 1/3 of the recoil then the left side tab (gun pointing away) pushes down and lets the mag valve close. Sometimes a new slide lets the blowback assembly ride a bit high so it does not reliably hit the valve disconnector tab so a lot of extra gas blasts out. On the way forward, there's another opportunity to hit to disconnnector so if the issue is sporadic you'll just see inefficient gas usage instead of a more severe total mag dump.

Also check to see if your oring/seal on your nozzle piston is seated correctly.

If the test turns up negative on many attempts (i.e. not even a sporadic issue) then I suspect that your reed valve is not pushing forward and shunting breech gas to blowback properly.

November 14th, 2008, 04:47	#3
MadMax Delierious Designer of Dastardly Detonations Trader rating Join Date: Dec 2001 Location: in the dark recesses of some metal chip filled machine shop	Try this test with an empty mag and a cocked hammer (mag in the gun). 1. pull trigger and hold the trigger down 2. pull upwards on the slide and pull it back 3. keep applying upwards pull to the slide and push the mag down onto a fill tip on your propane adaptor (difficult, but I'm trying to check something in particular) If gas flows out of the mag with the slide fully racked and pulled upwards, then your firing pin disconnector tab has not been pushed fully down so it disconnects the the firing pin and lets the mag valve close. The mag valve in your GBB is held open for the first 1/3 of the recoil then the left side tab (gun pointing away) pushes down and lets the mag valve close. Sometimes a new slide lets the blowback assembly ride a bit high so it does not reliably hit the valve disconnector tab so a lot of extra gas blasts out. On the way forward, there's another opportunity to hit to disconnnector so if the issue is sporadic you'll just see inefficient gas usage instead of a more severe total mag dump. Also check to see if your oring/seal on your nozzle piston is seated correctly. If the test turns up negative on many attempts (i.e. not even a sporadic issue) then I suspect that your reed valve is not pushing forward and shunting breech gas to blowback properly. __________________ Want nearly free GBB gas?