Barrel Exterior Diameters (inches) Under handguard 0.845 Gas block 0.875 In front of gas block 0.725 At muzzle 0.700 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. FAQ: Q: Why is there a unblasted area around the gas port? A: This is from where we tape over the gas port to keep any blasting media from getting into the barrel. Q: Is this the same barrel used in your factory builds? A: Yes, all of the barrels we offer as individuals or in kits are the same barrels used in our factory builds.
