The DPMS DR-10 bolt catch assembly. Includes Bolt Catch, Bolt Catch Detent, Bolt Catch Detent Spring, and Bolt Catch Roll Pin. DPMS Panther Arms is your source for AR-10 parts, accessories, and firearms. For best results, we recommend only using DPMS DR-10 parts with our uppers and lower receivers. We do not recommend using other manufacturers parts in our products. Made in America.