SIG556xi Field Strip.
Love this AR-like upper/lower set up; switchable charging handle (I keep it on the left), 3-position gas regulator, tool-less disassembly (including the lower handguard). Nice BUIS, quality bungee single-point sling (not pictured).
Great shooter; feels rock solid. First 120 rounds (.223 and 5.56) with zero issues.
Range report is coming up.