This thread is very relevant to my interests. I'm trying to build, update and/or buy an upper to use at my clubs High Power/Across the course matches. The options I've identified are:
1) Buy a new or lightly used 20" A4 National Match style upper I can get a new RRA NM A4 upper using the 18% off deal for about $791 + shipping. I just found a complete lightly used RRA A4 NM rifle that I might be able to get the upper for around $700.
2) Build one from scratch. I had not thought about this until recently as I expected to be able to find a lightly used one over the winter, but no such luck. I need to build out a parts and price list, but I can't imagine I'm going to save any money vs a used one.
3) Update my existing RRA A2 (not National Match, 1:9 twist, I want to shoot 77g) with a new barrel and FF handguard while I figure out options 1 or 2. I now have a spare KAC FF RAS so all I need is a 20" 1:7 twist barrel with, ideally, pinned FSB. Problem is that there is very limited choice and supply. Only new barrel I can find with an attached FSB is the Windham 20" for $215. I see a few 20" gov profile "A2" barrels, but then I'd have to send off for pinning. Any others I should be looking at? I've searched gunbroker, armslist and much of the EE.