"Yeah the old way sucks, thats why we lost Vietnam."
don't think so.
The reasons the AR16 didn't work in Vietnam were self inflicted. Having said that the AR style rifle has worked all of that out and it is a reliable system now. I started out in 1975 with the M16A1then went to the M16A2. Never had any reliability issues with any of them I was issued. I was still shooting Expert when I retired in 2004.
Have a nice day at the range
NRA Life Member