CMMG offers their "bargain bin" rifles for $600 (plus shipping and FFL receiving). Probably the best deal you'll find for a decent quality AR type rifle.
No, I cannot.
21.
Buy the best barrel you can afford.
One can buy AR 15 accessories from Rock River Arms. The company has retail stores across the globe, and they also have an online store which sells custom and pre-made AR15 accessories.
Gun shops, pawn shops, gun shows, want ads.
No one answer- depends on your wallet, your tastes, your uses. There are dozens of makers of good quality AR style rifles.
AR-15 is a manufacturer's designation. When Armalite designated the rifle the AR-15, both fully automatic and semi auto only rifles were dubbed as such. M16 is a military nomenclature. Now, the AR-15 rifles you can buy at your local gun store without having to obtain an NFA Class III permit - those are semi auto only.
catching fire is 17 ar points and mockingjay is 15 i think :)
The AR-15 was created by a design team led by Eugene Stoner. Initially, the AR-15 was intended to be a companion rifle to the AR-10; the AR-10 was intended to replace the M1 Garand while the AR-15 was intended to replace the M1, M2, and M3 carbines.
The AR 15 is a rifle, not a caliber. the .223 is a caliber. Usually the AR-15 is made in caliber .223.
The M3 is the semi-automatic version of the Ar-15 (M4).
No such weapon, so no. However, there there is a M16A4. It is possible, but, highly unlikely that an individual can buy one.