I have owned 2 Mini-14 rifles. I would never own another one. I have never seen a factory Mini-14 that would not walk groups when fired in rapid fire. Save your money and buy a Rock River AR-15-A2 national Match. You will see how accurate a 5.56x45mm can be.
I have one. Wouldn't recommend it for competition shooting but it gets the job done for it's designed purpose as a "ranch rifle." Accurate enough for plinking or varmints which is about all I would use a .223 for anyway.
I had a Ranch Rifle but sold it a few years back, nothing wrong with it and was fun to shoot...just realized I shot my ARs more. Figured I might as well sell it to someone who would put it to good use.