That's a chore. Took me a long time with alternating Kroil and B12 Chemtool. It was probably all wrong, but after soaking and rolling and twisting, and jiggling- I held the gas tube with the sight hanging down and I whacked it with a fiberglass hammer handle for a good hour (including soak times). Next time- I'm buyin a new gas tube.
Rednecks... Keeping the woods critter-free since March 2, 1836. (TX Independence Day)
I'm going to use the words "clip" and "Long Colt" every chance I get. It grinds my gears to see new members attacked when we all know dang good and well what's being refered to.