At the moment I have an 18" .338 Federal lightweight barrel on order form X-Caliber with a Seekins adjustable gas block on the way. I plan to marry this barrel up with a Blitzkreig Tactical 80% lower that is sitting in the mill right now and a Fulton Armory LPK and a LaRue Tactical MBT that arrived last week. Since it will be 10 to 12 weeks for delivery of the barrel I am considering a Luth AR MBA-1 buttstock with a standard 308 A2 buffer tube/spring/buffer and probably a D. Wilson BCG. For the upper I am not sure. I have a Spikes upper that I used on my initial .308 build that I replaced, it is nice but I may opt to go for a new upper. Now, the real question is, what should I put on the end of the barrel? This will be a hunting rig for larger, tougher game. Optics, I am likewise unsure. I have found great success with both my Vortex and my multiple UTG scopes. The UTG's are far cheaper but come close to the Vortex on light and all hold center on the Grendel, the Creedmore and the 308s. All suggestions are most welcome, particularly from those who have built .338 Federal rigs.