I FINALLY got the upper from my 'smith today. This build has been a long time coming. Upper: Daniel Defense lightweight CHF 16" barrel (midlength gas) RRA midlength handguards PK Firearms A1 upper generic BCG (thanks internet, no BCGs anywhere) Lower: PSA Blem Fulton Armory A1 stock Geissele SSA-E w/ PSA LPK MOE grip 20 round PMAGs Optic: 3x mini ACOG (TA33) I absolutely love this rifle. It ran 100 rounds of Hornady 77 grain steel match today without a hiccup. The ACOG on the carry handle is freaking awesome. I heard SO many people say that it was horrible, but the transition from the irons to the ACOG is seamless, and I still get a good cheek weld. 100 yard shots are child's play. I can't think of a single thing that I'd change, we'll see w/ time. Every AR that I ever build will wear a Geissele trigger too. It's easily the equivalent to the nicest bolt-action trigger that I've fired.