No such weapon.
If you mean the US Army, the M16 and the M4 variant of the M16.
Some guns include: Revolvers, AK's, M16, Uzi and much more...The ar15 and the m16 did not come into use until the late 60's. The weapons used before were the m14 and the m1 and m1 carbine.
The M16 was first used by the United States Air Force in 1962. Prior to this it was known as the AR-15. The United States Army began to field the M16 in 1965 in Vietnam.
currently, they issue the M16-A2 service rifle
M16
Yes. However, a used bolt face should not be used with any barrel other than the one it was originally mated with.
Depends on which powder is used, and there are several. If using Winchester W748, it would be about 23.5 grains of weight of powder.
5.56mm packs a punch. It's stopping power is good, but a gun like the MG3 can easily outkill an M16 with its 7.62mm rounds.
A typical M16 bolt weighs around 0.28 ounces or 8 grams.
In a way the M16 is a machine gun, but it can also do three round burst and semi automatic. civilians are not allowed to have automatic m16s unless you have an automatic weapons permit, but you can have a semi automatic M16. (an AR-15 is almost like an M16 and much cheaper if you're looking to buy one.)
An M16 is an Assault Rifle used by the military. I somehow doubt that a 10 year old would fit inside of one.