Im going to purchase a new A3 M1 with the three power optic, The only two things im bantering about is 20 inch barrel or 16, and NATO mag or AUG. Mainly because I have a metric shit ton of nato mags. Any help appreciated, And Im a big dude, 6f3 and 265lb, carried a M60 for years and spun it like a toy, Im just comfortable with something bigger in my hands, don't plan on any CQB. Thanks in advance. appreciate any help with this, I know the manual of arms is different with the NATO conversion but im cool with it as itll be all new and can get the right muscle memory quickly