So, I am sold on the 6.5, especially in the AR platform. I just put together a 24" heavy-barrelled DPMS LR-260. I also have an 18" 5.56. Since ARs are like crack to me, I started to jones for a Grendel. Long story short, I got a Grendel-marked AA lower, LPK, mags, and ammo and then the...