Anywhere from $300 - over $2000, depending on the manufacturer, exact model, and grade.
$800-$2,000.
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
100-1000 USD
$1599
Depending on condition and configuration, a few hundred to a few thousand.
AK47 M-16 AR15 1911-a1 BAR
you would get about $150.00 used
Try AR15.com Try AR15.com
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.
If it is one of the recent Colt .22LR AR15 rifles, then the answer is no - they are completely different internally.
Both are assembly line weapons. Stag in my opinion also has a better reputation. Unless you decide to go tactical, they are all pretty much the same. Bushmaster, dpms, stag ext..