12-02-2011, 04:25 AM
Just ordered a 19.5" AA upper with Shilen barrel. My reasoning was that if SAAMI has approved the cartridge design, then more manufacturers would support the superior balistics the round offers and that ammo and parts would become even more available (I can get Hornandy ammo 10 minutes from my house at Cabelas right now). Also, Alexander started the Grendel, I figure he has the most experience putting together Grendel uppers, that sold me.