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The M14, like it's base, the M1 Garand has a rotating bolt and a locking lug. The M1 Carbine (whose design was contributed to by a convict, David Williams), also uses a rotating, locking bolt. The M4, todays variation of the AR15/M16 design also uses a locking bolt.
Even the simple and very reliable AK47 has locking lugs.
Cool vid, yet a very simple design. Its cyclic rate on full auto would be hampered by the "bounce" firing from a closed bolt, but if it fired from an open bolt, the rate would increase at the cost of things invading the very large breech.
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