This goes out to the SAVAGE Community : I was rummaging through my parts stash this past weekend after a day of running the Savages with my Son and I came across a set of 4 O-rings from HPI , part # 6898 . I see they are listed in all Manuals from the Savage 21 to X 4.6 but they aren't in the exploded parts diagram. Dose anyone know what they are used for ???