What is an AR15?
AR15 is the name given to weapons that resemble the Armalite 15 rifle designed by Eugene Stoner. This weapon design went on to become the M16 and M4 rifles currently in use with the United States military. AR15’s can be made to resemble M16s and M4s, but they are semi-automatic.There are also many variations that cause the final product to look nothing like the classic assault rifles. Currently, Fabrique Nationale (FN) make M16 rifles for the military, Colt makes the M4, and Armalite is still in existence. However, many many companies make AR15 parts. Some of the more popular companies are Bushmaster, DPMS, Rock River, and Stag Arms. There are many others. Most AR15s fire the 5.56×45 NATO round. This round is similar to .223 Remington, but not exactly the same. The primary differences of 5.56 are a slightly thicker case, higher chamber pressure, and a slightly longer leade. This means that .223 rounds are safe to fire from 5.56 chambers, but 5.56 rounds might not be suitable for .223 c
