Diamondback DB10 308 Winchester 16in Black Nitride Semi Automatic Modern Sporting Rifle - 20+1 Rounds - Diamondback Firearms is proud to announce its line of DB10 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 Diamondbacks CNC facility. The DB10 raises the bar when it comes to features and performance when compared to others.