tacotime said:
Thanks.
Also wondering which versions/serials were maybe known as notoriously poor, or maybe known as the best of the bunch.
I'm beginning to see what you're getting at.
Myself, I've owned several of these things over the years, which by extension means that I've probably had about as much experience with the different variations as the next guy...or leastways, plenty enough to have formed some opinions.
To start with, Ruger has yet to market what I'd call "the perfect Mini". The reasons for that are many, but what it boils down to in terms of how I understand your question is this:
Some have better sights than others, but none were produced using the best rear sight in conjunction with the best front sight. The point there being that the best rear sighting arrangement went bye-bye with the pre-Ranch models, and the best front sight is only found on the 580-up models.
By design, some eject out the top, some out the side...meaning that the Ranch Rifle models are much easier to successfully mount a scope onto. If that's your thing, you may also be interested to know that somewhere towards the end of the "581-series" of serial numbers, Ruger began D&T'ing the Mini receiver and included a matching rail in the box for those who prefer conventional "Weaver type" rings.
As a group, and in terms of sitting at a bench while chasing small groups on a paper target, most of the blued Mini's I've owned would consistently outshoot most of the otherwise identical stainless models I've owned. I can't say why that is, I just know that that's been my experience. And FWIW, most of the as-issued Mini-30's that I've owned (or worked with) would outshoot most of the as-issued Mini-14's that I's that I've owned.
As far as barrel design goes, the 581-up has the best Mini-14 barrel by far...but, that particular barrel will not directly interchange on any other serial number series. Plus, it uses a 1-9 twist which may or may not be optimum what whatever use you have in mind. That said though, as far as I'm concerned...when Ruger began installing their "new-fangled barrel", they all but made their previous Mini-14's obsolete for anything other than casual plinking. Yeah, it really is that much better.
Are any of the others "notoriously poor" or "the best of the bunch"?...well no, not really. After all, when ya get right down to it, the Mini-14 is what it is, any/all of 'em will do exactly what they were intended to do, and baring some sort of factory defect, will reliably keep doing it time after time, year after year.
On the other hand, it is not now, nor has it ever been what it is not...so my advice to anyone whom may be thinking about buying one is to align his expectations accordingly. Otherwise, he'll surely be setting himself up for failure.
DGW