Here at Scorpius Tactical we have the Multicam Black M4E1 builder's set from Aero Precision for sale for $549.95! These sets are hydro-dipped with arguably one of the best looking multicam patterns and the set includes an M4E1 Upper receiver (with dust cover and forward assist installed), an M4E1 Lower receiver (with integrated enhanced trigger guard, and uses a set screw for installation of your bolt-catch) and a 15" Atlas S-One handguard with M-Lok attachment points and integrated quick-detach sling swivel mounts. Come on in, or have us ship this to your local FFL before it's too late!