I won't be jumping out of airplanes, repelling banzai charges, or such with any of my carbines, so it is likely even sporting-grade weapons will do OK. Moreover, an individual weapon must prove itself to be accurate enough, and supremely reliable, in my hands. I liked my first 580-series Mini well enough to get a second one, which was pre-owned but minty and mounted in a SCAR stock, when it presented itself at a good price.
MOA? I can't see the iron sights that well with my aging eyes. Maybe after I mount a scope. Minute of felon is good enough for now. In my world, 40 yards is a quite long shot. MOA is a luxury, not a necessity.
Cartridge? .223 JSP ammo has been dumping the trash well enough for domestic law enforcement for decades now.
It is taking me a while to get enough ammo through my Minis to really trust them, but so far, they have not let me down. I really shouldn't be using them for shooting people, just yet, anyway, so there is no particular hurry. My chief expects me to use approved weapons off the clock, as well as at work, against human adversaries. The only rifle I am presently certified to carry is an AR15. I do prefer the ergonomics of the Mini, and may get an opportunity to be certified to carry one, before I retire. After I retire, well, I can use the carbine I prefer. Might be a Mini, might be an AR, might be something else. Not likely an M1 Carbine, as its safety is not lefty-friendly.
Edited to add: BTW, the Mini is cosmetically simiiar to an M14, and does have a Garand/M14-style trigger group, but its gas system is more like that of the M1 Carbine.