locking shoulder is a part of an FN FAL rifle
yes you will definitely know you hit it. it could damage you alignmentand depending on how big the bump is do other damage underneath your car
as1 your in luck for this answer. go to the store and pick up methylated spirit or at your chemist ask for isproplyne alcohol.. take cover of and use above to clean the tape path looking for any rubber rollers as they will look very shinny, you must clean all paths that it comes into contact with. heads and also guides. by doing this as it would be what the tecki would do. 30 years in the Field of repair