Those statements can give some people a stroke, but once you’ve been there and done that, you hopefully have arrived at a happy medium.   Put me down as someone that was not a big fan of the AR15 design because I never understood why a gun was designed without worrying about how much maintenance it needed.   Don’t tell me that Eugene Stoner knew the gun was designed to do what it is doing today.  There was basically a disaster in place when the guns were first fielded and not until recently have the vast majority of AR15 owners realized that the direct impingement gun needs to be generously lubricated at all times to be functional.

There have been many improvements over the internal workings of the firearm from barrels, chamber chroming, gun magazines, improvements on ammunition and even changes to barrel twist have all gun us to where the M4 carbine is today.   The next major improvement with the M4 Carbine and M16 family of firearms is a lighter carbine like replacing your AR15 upper receivers without the compromises in durability.  That is something that has still been unproven with some of the newer lightweight uppers because of the time they have been out, but only time and testing will tell.