You know, I've heard so much of this 'mini-14s are crap' stuff that it's time I said my piece.
SOME Mini-14s are crap - not nearly as many as some would have you believe, but SOME. The crappy ones get sold or traded, fast and often. The same 'crappy' Mini-14 probably has six or seven owners, all of whom shout "MINI-14s ARE CRAP!" because it's the only one they've ever had in their hands....and the story builds.
The other detriment is the fact that a lot of folks who buy Mini-14s are into 'playing soldier', or have some fantasy about making noise and blasting off a 20 round mag in under 3 seconds....and not only ruin a barrel in a single afternoon, but tend to use the cheapest garbage ammo they can get their hands on. As long as it makes noise, and they can see dirt fly on the backstop.
I've had at least ten Mini-14s, and currently own three. Out of the ten, perhaps two wouldn't shoot under 3 moa with factory ammunition. The three I currently have will all shoot sub-2 moa with factory ammo, and hold 1 moa or very near it WITH PROPERLY ASSEMBLED HAND LOADS. No, they don't shoot well with $5/20 Norinco garbage ammo...and I bought them all brand new; I broke them in carefully, I've maintained them well, and I've never rapid fired them. My ego doesn't need that.
If you buy a used Mini-14, your chances of getting a decent one are greatly reduced. It's being sold for a reason, and you're probably going to be another guy who wails "Mini-14s are crap!'. Buy a brand new one, treat it like a rifle should be treated, and you might be pleasantly surprised. Or at the very least, buy a used one from a friend that you know not to be an idiot and who'll let you shoot it first. If he ever uses the word 'tacticool', run like hell.