Quote:
Originally Posted by Mobuck
"When you say erosion--do you mean literally metal is corroding away--or simply gas forces it's way past seals on the block and set screws?"
Hot, high pressure gas can cut(erode) the gas passage in the gas block as it blasts through the tiny orifice. Some(most?) gas blocks aren't made of material known for good gas erosion resistance.
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Yes, the hot gases, entrained sometimes with burning powder granules, gas cut the metal. The screws that go into the gas stream to limit flow are often the first to go carrying metal into the bolt and gas rings.
303 is a relatively inexpensive commodity stainless, even if with the L designation, won't last as a gas block long term. 400 series stainless with proper heat treat (which is the key) is the way to go. Odin's more expensive adjustable with Carbon Steel and the Inconel screw is better, but still has some issues.