Repeated firings will enlarge the flash hole of the vent liner and erode the 1/8” hex drive making it difficult to remove, open the group size considerably, and may result in inconsistent ignition. It is difficult to come up with an absolute number because of the variables involved but a good place to start is replacing it after 100 shots. An easy way to keep track is after ever box of primers. Don’t use this number as an excuse not to inspect the vent liner every time the breech plug is removed to clean the bore. As with any mechanical device, routine inspection is a critical responsibility of safe use – one which only you have control of. Be sure to wipe dry and lightly coat the threads with any Mil-Spec 907E anti-seize compound such as Birchwood Casey Choke Tube lube or Kleen-Bore® TW25B. This will ensure that these parts will unthread the next time the rifle is completely disassembled. Use it very sparingly or it will wick into the barrel and wet the powder - causing misfires.
How often should I change the vent liner?
