Originally Posted by Cunha
The only performance upgrades for the automag is the level 10 bolt, and the X valve which basically replaces the entire gun. Everything else reduces weight and looks different or feels different, thats all.
You missed the ULE body which upgraded the detent, barrel choices and warp feed mounting, and the intelliframe which upgraded to intellifeed with a revy or warp, as well as greatly improve trigger 'feel'.
IMO these were better inovations than the Xvalve (cause we already had the retro valve)
P.S. ULE triggers were developed as well, although I'm not a big fan of it.