[BlueSkyJaunte]

CavArms is no longer manufacturing lowers. BATFE basically harrassed them out of business.

If you see one of their lowers for sale, grab it. I have two, and think they're great. Ugly, but feel great and fit tight. I would recommend against a heavy upper to go with a lightweight lower (like the Cav). Barrel-heavy guns have their uses but a Cav is much better utilized by building a lightweight carbine out of it.

6.8 SPC is way ex$pensive. 6.5 Grendel even more so. I'd stick with 5.56/.223 or 7.62NATO/.308. Be mindful these are different platforms--AR15 vs AR10.

The FN SCAR is a nice unit, but I'm not convinced it's worth the price. The Bushmaster ACR (formerly the Magpul Masada) is even less so. You can build a hell of an AR for $2k.

I have two RRA triggers and a Timney 3# in my .308. The Timney blows the RRA out of the water for an extra $50-60.