I carried a Mini 14 for awhile in SD for awhile but bought the Sheriff's match grade M1A when he retired. Greater range and solid 3/4 to 1 MOA accuracy was nice in a big flat state.
Ruger Mini 14s have been popular in law enforcement, partly because they are not a "military" looking as an AR-15, M16A1, A2 or M4:
Ruger is also very good about supporting law enforcement Mini 14s'. If a department wears one out in training, Ruger will rebuild it.
On the negative side is the problem with poor accuracy due to the excessively whippy lightweight barrel. Back in the day, about all you could do was shorten the barrel to 16". Now there are a few different barrel stabilizers out there that will significantly improve accuracy.
The downside is that a fixed stock Mini-14 isn't much shorter than an M16A1, especially with a flash hider installed, so you encounter the same problem fitting them in a weapon rack in a patrol car. Like a 20" AR-15 or M16A1, they end up in the trunk, where they can be slow to access when needed.
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North Carolina recently surplussed some Mini 14s, but they came from their correctional system. The one I acquired was a 187 series Ranch Rifle with a 1-10" twist barrel.
It had a very heavy (7 oz) combination front sight, flash hider and bayonet mount on it in place of the standard front sight. On the plus side, it gave very nice 3/4" groups at 50 yards with Ruger's less than stunning rear sight. On the negative side, with the sight adjusted as high as it would go, the groups were still 8" low at 50 yards. It was pretty obvious NC was using them with a telescopic or dot sight.
The accuracy made some sense as Mini 14s in general have always shot better with some muzzle weight added in the form of a muzzle device. The choate front sight and flash hiders have always been a good choice.
I gave mine a make over, in large part because I wanted to be able to zero it from 50 to 350 yards with iron sights, and partly because the muzzle device was too heavy, too long, and too impractical.
Without the muzzle device it was a solid 4-5 MOA rifle with M193, which is fairly common for a stock skinny barrel Mini 14 or Ranch Rifle. I put an Accu Strut on it along with a Choate Browning style flash hider and front sight, a .045" gas port bushing, a shock buffer, a Tech Sights rear sight and a choate ventilated handguard. I donated the stock to another Mini 14 project and put a Revolution walnut stock on it. I also opted to put a 2-7x33 Leupold scope on it.
The end result is a better looking Ranch Rifle that produces 1.5 MOA 5 sot groups at 100 yards:
My other Mini 14 is a 184 series Mini 14 that I picked up used after someone had shortened the barrel to 16", which was commonly done as a means to improve accuracy. In this case it wasn't effective as it was still a 4-5 MOA rifle.
I gave it the same treatment as the rifle above and got the same results - 1.5 MOA 5 shot groups at 100 yards with M193.
Given the accuracy potential for an Accu Strut equipped Mini-14, or the current 58X series tapered barrel Mini 14s which shoot to a 2 MOA accuracy standard, I'd have no reservations about carrying one today.