Burrhead,there is more than one way to skin a cat. I'll give it to you turning a straight tube upside down might be a good idea. I never bothered to disable a gas system before.Don't figure I ever will.I like semi-auto. I did not think about it that much.
I suspect you haven't either. I'm thinking you put a tube in upside down and your gun didn't work.
Actually no, I’m just some dumb peckerwood who’s spent some decades living a long way from anywhere. The grocery store is 90 miles away, nearest stoplight 160. We now have a 8oo sq’ hardware store, internet, and Amazon but at one time it took a lot of ingenuity to make mechanical things do or stop doing something, keep well water corralled in pipes and not die in the desert with very limited resources. Sometimes one has to just sit back and ruminate.
Want to keep a gas operated machine from running? Stop the gas. How to do that without a lathe or tap you don’t have? Can you fix a flat tubed tire with a piece of wire? Start a fire with a battery? I donno, what’s the simplest, quickest way?
DamnifIknow, I’m just a hick.