The Mini-14, chambered for .223 Rem ammunition has not been the most impressive rifle for accuracy unless quite heavily upgraded. At 100 yards and a five shot group - it seems all but guaranteed that one shot at least will totally ruin a group! Perhaps to state 4 MOA is being generous.
It is believed however that the latest Ruger offering has improved matters and as a gun platform it is most compact and is really just a carbine. It's action is based on the Garand action and that is most reliable - with rapid fire being very easy.
This example has always been a fun gun for most part and additions were made regarding a barrel heat shield and a simple muzzle brake. It was a lot of fun - and was sold on some time ago.
Gobango.net web site - see this picture and many more, plus articles.