In 2014, American firearms designer Jim Sullivan offered a video job interview with regards to his contributions for the M16 and M4 family of rifles even though Doing the job for Armalite. A observed critic on the M4, he illustrates the deficiencies found in the rifle in its present-day configuration. https://johnnywymao.blogozz.com/29020111/the-best-side-of-knights-armament-m4-quad-rail