M16A4 Buttstock With regards to employing iron sights the longer barrel and fixed entrance sight gives an extended sight radius that makes it much easier to shoot properly. After a while the Marine Corps did approve using the 6-placement collapsing stock on M16s for smaller sized shooters to employ whilst https://lukasblqfk.blogdigy.com/new-step-by-step-map-for-knights-armament-m4-quad-rail-44030200