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| | M4 Carbine at opensource encyclopedia (Site not responding. Last check: 2007-11-06) |
 | | The M4 Carbine is a shorter, and lighter version, of the M16A2 assault rifle, achieving 80% parts commonality with the M16A2. |
 | | As with many carbines, it was meant to provide troops with an effective, shoulder fired weapon in lieu of pistols, such as the M9. |
 | | The M4A1 carbine, an improvement upon the M4 carbine intended for Special Operations use, features a fully automatic fire mode, a flattop NATO M1913-specification rail on top of the receiver (for attachment of optics and other devices), and a detachable rail-mounted carrying handle. |
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