Good point.
I am having a hard time deciding whether to get a .308/7.62 rifle at the moment partly because of this.
Bushmaster doesn't exist at the moment and Armalites can't be had.
LMT, Knights, DPMS/Remington have one thing in common in that they will all take the 7.62 Pmags.
LMT and Knights are a bit out of my price range at present, so I am looking at the Remington with some modifications, but that has issues with barrel dia, threading, and apparently being fussy about what it eats. The only upside is that I can get it locally, and cheaper than any of the DPMS that I have seen.
Regards.
Mark