I have used a very light grease and G96 Gun Treatment (very little) on the outside of the tube for about 45 years now... never had a problem in doing that... If you get failures to feed or eject a dry may tube is usually the problem if the friction pieces are set correctly.
Same... Just a light spray of G96 and then gentally wipe off. Never had a FTF or FTE or any sort of feeding issue.


















































