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Old October 10, 2017, 09:54   #3
gunplumber
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FALaholic #: 96
Join Date: Jul 2000
Location: Surprise, AZ
Posts: 23,550
WTF are you talking about? The hole are for overpressure. Like on the FAL. It has nothing to do with cycling. Gun will run without a gas tube. It's not even called a gas tube, it's a piston guide - that's the sole point of it - so the piston can find the gas chamber on return.

The AKM holes are partially occluded by the piston guide. Normal.. Doesn't hurt to have an AK tube on an AKM gas chamber, but an AKM tube on an AK may direct overpressure/OOB more into the receiver. If one happens to have a malfunction like that. Otherwise, it's irrelevant.
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