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I plan on using a complete lower.
I think you mean upper.
I'd like input on +/- of a pencil barrel VS standard barrel.
Weight savings is the biggest reason to with a LW barrel, for ease of carry and maneuverability, LW does not mean "inaccurate" but nor is the best for precision work. If this will double as an HD gun, LW all the way, if punching tiny holes is more the goal I'd lean to a heavier profile SS barrel and would probably bump up to an 18" barrel with rifle length gas system.
Nickle Boron BCG VS standard. !
I would not pay good money for an NiB BCG, period. If not done absolutely perfect (nothing I'd count on from lower tier manufacturers) the process can lead flaking and/or have hydrogen embrittlement of the steel resulting sheared lugs. If you want a fancy, easy to clean finish the go with Robars Np3, both SIONICS and Forward Controls offer Np3 BCGs and I believe SOLGW does or will soon as well.
Drop in Trigger VS non-drop in.
I'm not into cassette triggers at all. Blown primers, or torn rim casings can lock up triggers and they are more difficult to get back up then standard style triggers. Not really an issue for plickers. I think there is very broad spectrum of quality out there on them as well. Consistency between lowers and more forgiveness to out of spec lowers is where they shine, IMO.
Does buffer tube, spring, plunger really matter which one. Is more expensive more better?
I won't not build a personal carbine without an A5 system...
VLTOR A5 Buffer System Overview
LaRue Tactical MBT-2S Trigger - LaRue Tactical
As good as a Geissele at half the price in my opinion.
IMO, not quite as good as a G trigger, I'd say 80-85% of the trigger for half the price or less. Definitely the best dollar for dollar trigger on the market at this point in time.