7.62x51 NATO
The M16A4 assault rifle is chambered for the 5.56x45mmNATO cartridge, which is of the .223 caliber.
your rifle was made in 1940
No, the two numbers are clearly different. In a more practical note, "7.62" is the diameter (in millimeters) of a bullet typically fired from a .30 caliber rifle such as a Chinese SKS or Russian AK-47 rifle, while "5.56" is the diameter (in millimeters) of a .223 caliber bullet like the M-16 or AR15 rifle.
$900
Eugene Stoner originally invented the M-16 A1 rifle, though since its creation it has met the hands of many engineers.
Yes
By definition, a carbine is a short rifle. The standard M-16 has a 20" barrel, while the M-4 has a 16" barrel. A number of US Rifles have had carbine versions, with the notable exceptions being the M-1903 and the Rifle, .30 M-1.
a .22 caliber
M-16
Colt's Manufacturing.
Armalite