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Am I mistaken to think that the main difference between the M1 and the M14 is the removeable magazine in the M14? I am under the impression that the M14 was a modification of the M1, using a removeable magazine instead of the eight round "en-bloc clip" of the M1?
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The M14 is a thorough redesign of the M1. For one thing, the entire gas system is different. (There was a comment about "bending the operating rod" when using commercial ammo -- that's true of the M1, but the M14 does not have an operating rod like the M1.)
The M14 uses a captive, short-stroke piston. The piston is like a water glass, base to the rear, with a hole drilled in the side. Gas is vented into tne piston, filling, and driving it back as the gas expands. As the pistopn moves back, the hold in the piston moves out of alignment with the hole in the cylinder and barrel, shutting off the gas flow.
The beauty of this system is that it is self-adjusting. If you have underpowered ammo, or an excessivley dirty rifle, the gas pressure is lower, the piston moves more slowy, and gets more gas. If you have high pressure, the piston moves more quickly. No need to adjust the system -- it takes care of that for itself.
The piston is captive, short-stroke. As it moves back, it strikes a counterweight, transmitting it's energy to that weight, which is what unlocks the bolt and drives it back. It's a very smooth operating system.
I trained on the M1, carried one on my first tour in Viet Nam (haveing wrapped my issue M2 carbine around a tree), and had an M14 (pre-M21) sniper rifle on my second tour. At the same time, I sometimes operated with Australians, who used the FAL. I like the M14 better.