I have a 20” stainless match barrel I will sell off this beauty. 1/7 twist heavy barrel. Good for 600 yards easy. $140.00 or the complete Aero Precision upper with Magpul handguard less BCG. $425.00. (The photo was made before the muzzle brake was clocked.)I'm of the mindset that I want to build a long range AR set up...Not sure I'm capable of long range accuracy, but hey, I'm looking into the idea. Thinking in the 500 to 600 yard range. Any tips, recommendations, or warnings I can get will be appreciated. Scopes? Ammo? good quality lower? Thanks guys....