IVE READ ABOUT THE TWO BEING DIFFERENT.... THAT YOU CANT MIX AND MATCH....
WITH ARS THERE ARE BARREL EXTENSIONS, CARRIERS, AND BOLTS..... EACH SPECIFIC TO THE
DPMS OR AR10 TYPE....
I HAVE A SAVAGE MSR10 IN 308.... THE UPPER HAS THE STRAIGHT DIAGONAL LINE TO COUPLE WITH THE
LOWER. NOT...