M14s were designed and manufactured as selective-fire rifles, but in practice they were pretty much uncontrollable during full-auto fire, and as a result, nearly all of them had their full-auto functionality disabled by military armorers, making them semi-auto-only like the M1 Garand.
The FN FAL is more controllable in full-auto mode due to its buttstock being more inline with the bore axis, but anything lighter than a light machine gun is going to be quite a handful in full-auto if chambered for 7.62 NATO / .308, which is a full-power rifle cartridge that's comparable to .30-06 military loads. The M16 has a buttstock which is completely inline with the bore axis, and that, combined with the very light recoiling 5.56/.223 intermediate cartridge, makes it very controllable in full-auto mode.
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