From The Manufacturer/Wikipedia/People Smarter Than Us:
Diamondback Firearms is proud to announce its NEW line of DB15300S rifles made entirely in the USA! Starting with the tried-and-true, U.S. Military-proven gas-impingement system and using only the highest quality components machined in Diamondback’s CNC facility. The DB15300S raises the bar when it comes to features and performance when compared to others. From the modified Diamondback aluminum four-rail handguard, to a variety of color, sight, and stock options, the Diamondback DB15300S represents value and versatility all at a very affordable price.