The US Army presently uses the M4 carbine, a shorter and much modified version of the Armalite AR15.
From 2013-2015 it has been the AR15.
Licence requirements are based on the laws WHERE YOU ARE. They vary greatly from one country to another, and one US State to another. And YOU did not tell us where your are. In most of the US, no, a license is not required to purchase a semi-auto AR15. Your spelling of 'licence" may indicate you are not in the US. In Australia, a licence is required to obtain ANY firearm. An AR15 is a Class D firearm, and cannot be owned by the average private citizen.
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Only if there was one made for an AR-15 upper, which there isn't.
The US Army buys the M-16, not the AR-15. Replicas are not firearms and can't fire.
If it is one of the recent Colt .22LR AR15 rifles, then the answer is no - they are completely different internally.
Yes
1959
Colt has not offered a AR15 in 308
The most purchased paper towel brand in the US is generally the least expensive brand or the store brand. Of the major brands, Brawny is the top selling brand in the US.
The members of the usa archery team use a hoyt prototype recurve bow