Also, and I mean this with all due respect to the members here, if you want to really learn about these rifles, this forum is not the best place.
For Minis, try the "Perfect Union" site's Mini-14 web pages. Some members at Sigforums appreciate Minis, too.
There is a member at Sigforums, arcwelder, who really knows the M1A/M14. I know there are other sites with members who know these rifles, but cannot think of any at the moment.
The High Road dot Org will have members who know quite a bit about all of the rifles in question. You will, of course, get some ignorant responses there, too. That place is a big umbrella.
Like I said, I am not meaning any disrespect to this forum! Some members here will indeed have good information to provide about their rifles. But, this website specializes in concealed carry weapons, equipment, and issues. I come here to learn and share things about CC. I usually look elsewhere for rifle information. I will say there are some very good AR15 folks here!