Originally Posted by AustinTx
I am slightly amused at people that buy a gun, made by injecting molten plastic, into a form and worry about MIM parts in it. Assuming, Glock's bad extractors are MIM (which I'm not sure anyone knows, positively), They don't work because they aren't the right size or shape. Evidently people can tell they're the wrong size, by eyesight.
Locking Blocks: My old Gen 3 Glocks appear to have some sort of molded locking blocks, in them and never broken one yet. The ones I checked, have a sprue from the mold.
Yes the locking blocks at least around mid 2000 at least in the examples I have seen are investment castings as are the extractors.
Ruger long ago perfected and proved investment casting,when done with proper steel and properly heat treated has excellent strength and wear longevity.