After shooting an M1 for several years, I was delighted to be issued a M14 during AdvInfTng at Fort Ord in 1967.
How did you like those 5 pound (just kidding they only felt that heavy) empty steel detachable mags with the sharp square corners that snagged on everything and had to be lugged around and slowly reloaded? Give me an en bloc clip and the ability to get REALLY low in the prone firing position every time.