Discussion in 'Gunsmithing and Repairs' started by Garandman3, Jul 9, 2020.
Have you run any air through the gas system to see if it blocked? Plug the barrel and used compressed air to see if any air is coming through the gas tube. Or apply air to the tube and see if it comes out in the barre. Carbon can plug things up hard and make it hard to remove.
Have you removed all of the carbon build up in the BCG. It takes a special tool to remove this, solvents alone do not work.
Rings on the bolt should have a 0.005" fit to the bore which is normally 0.5". The OD of the uncompressed rings should measure 0.505"+. But none of this matters if the gas system is not transfer the gas to the BCG.
15/1000" drilling probably didn't screw up the gas system any more than it was.
So you've checked the following for alignment and tightness, correct:
Gas block, you said you removed cleaned and enlarged the gas port
Gas tube, you soaked with the gas block, have you ensured that it is free of debris by using a pipe cleaner to ensure it will go through without blockage?
Gas key, see below
Bolt rings, your test has shown they are in good shape
Is your gas key tight? You shouldn't be able to loosen the gas key bolts with less than 30in/lbs. of torque. You are on the right track, tracing the gas through the whole process.
It seems like you have not yet fully inspected the gas key for leaks, I would start there and see if you have carbon flashing out the sides of the mating surface of the key and carrier.
Do you have another carrier that you can put your bolt into and see if that alleviates any gas key leakage issues?
Thanks for all the input.
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