The M16A4 is a realistic military assault rifle with a modular design, featuring a full-length Picatinny rail system for attachments. It has a sleek, angular black polymer stock and handguard, complemented by a metallic upper and lower receiver with a matte finish. The barrel is long and cylindrical, with a distinctive flash suppressor at the muzzle, and the weapon includes detailed iron sights and a collapsible stock for adjustable length.