PRODUCT DESCRIPTION PRODUCT SPECIFICATIONS DB15O 5.56MM ODG 16" M-LOK Manufacturer: Diamondback Firearms Model: Obsidian DB15 Rifle Rate of Twist: 1-in-8 Finish: OD Green Cerakote Action: Semi-Auto Thread Pattern: 1/2x28 Capacity: 30 + 1 Barrel Length: 16" Color: Collapsible / Folding Stock Magpul CTR Stock UPC: 810035756021 Caliber: 223 Rem | 5.56 NATO