What would be the advantage of making the Knight version with a non-removable vent liner? Doesn't make sense to me. I thought the reason for a vent liner was to improve ignition and extend the life of a breech plug by making the vent liner removable and replaceable when it becomes eroded? Being able to remove the vent liner for cleaning seems like a good idea, too.

The only reason I can come up with for making it non-removable is perhaps a financial advantage/improved profit margin for the manufacturer? When the vent liner erodes in the non-removable version will a person just throw out the breech plug and be forced to buy a new breech plug/vent liner assembly versus buying just an inexpensive vent liner?

Maybe the "average Joe" will not wear out the vent liner- somebody that does little target shooting and mostly just hunts in the Fall?

Please forgive me if my question is off target or has an obvious answer; as I am still learning about Knight/Lehigh conversions and it's all pretty much new to me. Thanks