RIFLE: DIAMONDBACK FIREARMS MODEL DB-15, SERIAL NUMBER DB2530098, BLACK (MATTE), CASE NOT INCLUDED, 18, .300 BLACKOUT, SEMI - AUTOMATIC Notes: The DIAMONDBACK model DB15 is a 18 inch rifle chambered in .300 aac. Comes with one 30 round magazine and BCM vertical grip. (These photos are the best statement of condition. please review them carefully before purchasing.)