AMU testing 6.5 based on Carcano case

[LRRPF52]

Why would you expect changes to the AR10 receiver profile?

If you ever get to fire or handle an original AR10, it feels like an AR15 because the bolt carrier and receivers are much shorter than the 1993-forward AR10's, starting with the SR25. They did that so the BCG tail could articulate inside of an AR15 extension tube. The original AR10 has a much larger diameter extension tube, with a fatter, shorter BCG tail. The weight and balance of those rifles is fantastic-a true infantryman's rifle that just feels great in your hands.

Now that the GII is out, it has gone back to that formula, only using an AR15 diameter BCG that is slightly longer, but much shorter than an SR25 BCG. The GII has made the 1993 receiver and BCG designs obsolete overnight, if you are looking for weight savings, as well as human interface improvement.