I agree theAR is one of the most easily accessorized rifles made but as a combat rifle it's one of the biggest p.o.s. ever issued.
Cooper's name has been mention, well the Col. also stated the M-16 /AR is a fine weapon as long as you 're not asking combat vets who arse 's were on the line that used the weapon. The only reason it hasen't been replaced as primary battle rifle is costs plain an simple.
New issue M-16 's need only to shoot 4" group at 100 yard to be acceptable for issue.