In 2014, American firearms designer Jim Sullivan supplied a online video job interview with regards to his contributions on the M16 and M4 family members of rifles though Performing for Armalite. A pointed out critic on the M4, he illustrates the deficiencies found in the rifle in its current configuration. https://edgarzxnfs.blogrelation.com/35560464/little-known-facts-about-knights-armament-m4-quad-rail