On the vast majority of Lefever ejector guns both the hammers & ejectors are cocked on opening the barrels. No breech face rubbing takes place. They do open just a tad harder, but not really noticeably so. They do close real easy in comparison to one of those rubbing the breech face.
I once had an 00 grade L C Smith ejector gun which was well used. The breech face on it was quite scored from having cocked those ejectors so many times. I suspect an occasional wipe of oil would help considerably, I doubt the one I had ever saw a drop of oil there.
