In 2014, American firearms designer Jim Sullivan delivered a movie interview regarding his contributions towards the M16 and M4 relatives of rifles although Doing the job for Armalite. A famous critic on the M4, he illustrates the deficiencies present in the rifle in its current configuration. From the online video, https://kaccarbinerail51592.post-blogs.com/50983179/knights-armament-quad-rail-fundamentals-explained