A combination of mechanical processess and hand assembly.
You will have to call Colt and tell them the serial number.
Variant of the AR-15 manufactured by Colt. It had a 'slab side' lower and no forward assist.
According to info available on ar15.com, your weapon was manufactured in either late 1972 or early 1973. I own one made in 1974.
The Bushmaster AR15 was first in service in the USA 1958 and is still used in present day. It was designed by Eugene Stoner and manufactured by various companies including Bushmaster.
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
By it's serial number. Go to www.proofhouse.com and under 'long rifles' listing look for AR15 Sporter
Its ar15