This is a bit older thread, but thought I’d post this in case might be helpful for someone down the road looking for Mini 14/30 parts.
One other place to get Mini 14-30 parts is:
gunpartscorp.com/gun-manufacturer/ruger/rifles-ruger
I have gotten several parts for my Mini 30 custom build, got a extra(bare) bolt and had it fitted/headspaced when rebarreled, so have a spare in case ever needed down the road.
Just make sure get the correct series as some parts fit on any year/series and some are series specific.
Have found that Midway is cheaper if they have parts needed, but Numrich has most every part available except receiver.