AERO PRECISION M4E1 , , SEMI, 5.56 MM, BLACK (MATTE), CASE NOT INCLUDED, 16" NO MAGAZINE, OR CASE, IN GREAT CONDITION, PLEASE SEE PHOTOS FOR MORE DETAILS Notes: The Aero Precision M4E1 is a modern AR-pattern semi-automatic rifle platform known for its distinctive receiver design and modular configuration. Depending on the specific variant, it may feature an M4E1 enhanced upper and lower receiver, free-float handguard, adjustable stock, and configurable sighting system. Specifications can vary by model and configuration, including chambering, barrel length, furniture, and other components.