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The original question was about the manufacturers' choices. As near as I can tell, it varies all over the place. Some free-float, some don't. Some only do it for precision or target rifles.
Whether do-it-yourself or have it done by a gunsmith, glass-bedding the receiver has been a common practice for over sixty years that I personally know about.
As far as the manufacturers choices, I'd sorta guess it has to do with the precision in manufacturing the stocks. But that's just a guess.
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