Don't know where you got that, I owned three from all three eras of manufacture and none of the many magazines had any oiling pads.
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I honestly don't recall the source. I thought that it was odd at the time, because I was instructed to keep a firearm chamber clean to oil to minimize bolt thrust, but as the M1918 BAR and it's variants are capable of fully automatic fire, and extraction is a major concern, I just mentally filed it away. If the information is incorrect, thanks for the clarification. I also read that some ammunition was waxed to aid extraction - is that incorrect?
This is off topic to the issues relating to the Ross rifle. A quick search answered my own question concerning waxed cartridges:
http://https://www.thefirearmblog.co...ation-process/
http://https://patents.google.com/patent/US2972947A/en
http://https://www.youtube.com/watch?v=KSnwsSlu7Sk
Finally located the reference to lubricating pads in magazines: the Thompson Automatic Rifle, not the 1918 BAR:
https://patents.google.com/patent/US1322271
RIA: Thompson Model 1923 Autorifle Forgotten Weapons
response No. 7:
http://https://www.thehighroad.org/i...uality.750367/
I've read that it is easier to find a Ross Mk III with the bolt "safety rivet", than one without. You don't go to that much effort to prevent misassembly unless there is a definite problem - even if the modification is only to bolster user confidence. It will always be the "elephant in the room" with the Ross Mk III.