This Alexander Arms® 6.5 Grendel barrel is fully-inspected by Alexander Arms® for proper chamber, bore, gas port, and all other critical dimensions. This product carries our standard one-year limited warranty against factory defects of the parts being sold.  Warranty does not cover the final functionality of the rifle built with this barrel. Because of the advanced nature of firearms assembly and the possibility of physical harm to a user, it is expected that the assembler of this barrel has adequate technical knowledge of firearms assembly.