I'm going to build a rifle around Wifey's Anderson lower she won in last months raffle. I plan on using a complete lower. I'd like input on +/- of a pencil barrel VS standard barrel. Nickle Boron BCG VS standard. Drop in Trigger VS non-drop in. I'm mechanically inclined so assembling a trigger in the lower shouldn't be a problem. Does buffer tube, spring, plunger really matter which one. Is more expensive more better? We're looking at this upper ... PSA 16" Mid-Length Pencil 5.56 NATO 1:7 Stainless Steel 13.5" Lightweight M-LOK Upper with NiB BCG, CH, & MBUS Sight Set Wifey likes to sit at the bench and punch paper. Or ring the gong at 100 yards. Right NOW I'd like to know if we should jump on the upper. It was up a couple of day ago, and then was gone. It's up again this morning and i want to get it if it's looks to be a good one. Thanks Guys!