In 2014, American firearms designer Jim Sullivan furnished a video interview pertaining to his contributions to the M16 and M4 family members of rifles even though working for Armalite. A famous critic from the M4, he illustrates the deficiencies present in the rifle in its present-day configuration. Inside the video https://angeloedccv.creacionblog.com/29403638/what-does-knights-armament-quad-rail-mean