7.62×39mm
The AK-47 shoots a 7.62 x 39mm bullet. The 39mm indicated the length of the brass/steel case.
7.62x39mm
7.62x39
The term "762" refers to a 7.62mm bullet. This is a common size for European guns and the AK-47. The 54 refers to the length of the round or the powder, I forget. Not sure exactly what bullet this describes but that is the diameter size (caliber) of the bullet.
Best left to a gunsmith
Very small trees.
one hundred and twenty three pounds
In the 2000-2200 fps range.
1776mph over 2000fps
The bullet energy from the AK 47 is higher than a round from an M16 or M4. That doesn't mean it is necessarily a better weapon. The AK 47 is very reliable but the M16 is much more accurate.
The cartridge is 7.62mm x 39mm long.