I prefer the mini m16 extractor. It's slimmer, sits right next to the lug. It's possible the brass could contact the scope on the way out. Can't see it causing failure to extract or scratching a scope. Between my personal rifles, customer installs, conversations with other smiths and shooters, I've never heard of or seen an issue.
Are the m16 placed above the lug or has anyone tried the install method of putting the m16 extractor inside the lug to get the .3 oclock hold on the case and if anyone has how did they do it . I have heard of issues with placing above the lug having the case ejecting to far up and contacting the scope anyone seen these issue and how to keep from happening