A had a pre ranch rifle and mini 30 mini 14. I fitted a scope on it and buffers on the gas block. This thing shot one and a half inch ten shot groups all day long. I did dress the trigger making it crisp and smooth. A friend bought his at the same time. The only treatment his got was a polished trigger. His was pretty accurate too. At some stage I fitted a smaller gas port bush which greatly improved ejection. I never checked the accuracy like that. I did shoot it for a while with the gas port blocked and accuracy was about the same.
I found a note I had made in which I recorded a 1 MOA group with a different bullet. I must add though that with Speer 55gr SP's it shot a double group. I tried Hornady 53gr match bullets and those were the ones I stayed with because of the accuracy. Factory ammo groups were 3 MOA. No good for varminting.
My mini 14 was my favourite rifle. Small, light and handy.