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Originally Posted by pmulcahy11b
The M16A3 is the M16A2 with a flattop receiver, topped by a MIL-STD-1913
rail. The front sight is retained; a BUIS (Backup Iron Sight) can be attached to the receiver rail, and the BUIS for the M16A3 isn't much different from that of the M16A2 in function. Some BUISs fold, allowing the shooter to keep it on his rifle even when optics are attached. The M16A3 uses the 3-round burst setting of the M16A2.
The M16A4 is the M16A3 with full-auto capability instead of the 3-round burst setting.
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One minor correction, you have the versions reversed. The A3 is fully-automatic, the A4 is limited to 3-round bursts.
http://www.armyproperty.com/Equipment-Info/M16A3-A4.htm
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The standard M4 is basically a shrunken M16A2. M4 handguards cannot be used on an M16 or AR15 series and vice-versa. The M4A1 is the M4 equivalent of the M16A4. I've heard of an M4A2, but I don't remember offhand what its characteristics are. A civilian version of the M4 exists (going by the same name), but it has a 16-inch barrel as opposed to the 14.5-inch barrel of a military M4.
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Also, not entirely accurate. My Colt LE6920 has a 14.5" barrel from the factory. Even the newer 694- series has an available 14.5" barrel. I think it's the 6944 or 6945, I don't remember which.
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