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
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..
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.