This was built by me. Works great, not too gassy. Shoots very flat. Has an aero enhanced lower with mix of parts. (DD for the lower kit schmidt milspec trigger, and mil spec buffer/H3 buffer system). Upper is completely PSA but with a BCM/Vltor charging handle. 11.5" Barrel Chambered in 5.56/223 10" Handguard. Lightweight setup. Comes with a brace.