i didn't know this...quite cool

[goo]

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"Ballistically, the M1 carbine's little .30 Carbine cartridge packs about 2.5 times the kinetic energy of a standard .45 ACP or 9mm load fired from a pistol. This is solidly in the energy territory of the .44 Mag. revolver. Indeed it has only 90 ft./lbs. less energy at the muzzle than the Russian 5.45x39mm cartridge and is only a little farther behind the .223 when fired from 14.5" or 16" barreled carbines."
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The M1 Carbine For SELF-DEFENSE AND LAW ENFORCEMENT | Guns Magazine | Find Articles at BNET

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