I was tempted to not respond, since most of us know that 1/2 MOA is basically competition grade precision shooting, and I can see lots of experienced gunnutz dismissing this thread due to the apparent silliness of the question.
But, if everyone does that, the OP won't get any answers.
So here goes.
There are few real 1/2 MOA firearms out there, period. Very few of that very few are semi-auto. You'd better be ready to basically spend thousands of dollars if you want one. Even then, it will likely need tuning etc.
The other thing is, this is the "hunting and sporting arms" forum - not the precision rifle forum. 1/2 MOA is not needed for a hunting rifle, period. Most hunting rifles are 1.5 MOA and that's just fine. Personally, I only ever met three guys who insisted on having a 1/2 MOA rifle for hunting, and all three of them were basically accuracy nerds who did very little actual shooting or hunting, but for some reason made an apparently random decision that they needed 1/2 MOA rifles. They spent lots of time badmouthing perfectly good firearms and very little time actually hunting, which none of them were actually any good at. The only one of those three guys who I know actually killed anything did so shooting a black bear in a ditch at about 50 yards - apparently you need a 1/2 MOA rifle for this.

He also kept bringing up his awesone hunting performance pretty regularly to anyone who would listen.
You can hunt just fine with a 1.5 - 2.0 MOA Norc M14 if you want, or any of the other readily available semi's.