Yes! You can have an ordinary rifle and you don't have to have a license. But a Full-Automatic, military issued rifle needs to have a license. MAKE SURE YOU HAVE A LICENSE FOR IT!
According to info available on ar15.com, your weapon was manufactured in either late 1972 or early 1973. I own one made in 1974.
Try AR15.com Try AR15.com
If it is one of the recent Colt .22LR AR15 rifles, then the answer is no - they are completely different internally.
1959
Yes
The US Army presently uses the M4 carbine, a shorter and much modified version of the Armalite AR15.
Colt has not offered a AR15 in 308
Someone over at AR15.com would probably be able to point you in the right direction.
Yes. Have fun paying for it then lugging it around, though - that's a whole lot of weight you're adding to the rifle.
You must be 18 years of age to purchase a shotgun or rifle,and you must be 21 years of age to purchase a handgun.
By it's serial number. Go to www.proofhouse.com and under 'long rifles' listing look for AR15 Sporter
@ 40 inches.