RIFLE: ABC RIFLE COMPANY MODEL ABC-15 RIFLE, SERIAL NUMBER 77-12737, BLACK (MATTE), CASE NOT INCLUDED, SEMI - AUTOMATIC, 5.56 NATO, 16 Notes: The ABC Rifle Company ABC-15 is an AR-15-pattern firearm associated with the 5.56 NATO cartridge. Public records from the Maryland State Police identify the ABC-15 under ABC Rifle Company and list 5.56 NATO among its chamberings; the same model is also documented in 7.62x39mm and .300 BLK configurations. Because ABC-15 configurations can vary, the exact barrel length, furniture, sights, magazine capacity, and other specifications should be verified from the markings and configuration of the individual firearm. Key Features & Specifications Manufacturer: ABC Rifle Company Model: ABC-15 Type: AR-15-pattern rifle Chambering: 5.56 NATO Operating system: Semi-automatic Platform: AR-15 pattern Receiver: Configuration may vary by production model Barrel: Varies by configuration Stock: Varies by configuration Handguard: Varies by configuration Sights: Configuration dependent; some examples may use a rail-mounted optic or backup sights Magazine: Detachable magazine Finish: Commonly black, depending on configuration