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I know the blue is RIFLE? and black is for our carbines (and some use black for any length gas system), but what are the physical differences between the two buffer inserts? Is the blue a WEAKER/SOFTER compound or lower durometer or what????
In the commercial market, black extractor inserts are generally stiffer.
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I have always been surprised that swapping from blue to black could make much difference. I know just having some kind of insert inside the spring, will stiffen it, but does swapping from blue to black make that much difference?
I would think the spring quality, and rubber O-Ring being added, would make the most difference, no?
You most likely wouldn't know the difference (especially if you are running a CS extractor spring and a Crane O-Ring). It is just one more piece of the puzzle to making the AR platform run as reliable as possible.