luvs2hunt,
NC Star optics are NOT known for their clarity or ability to accurize a rifle.
To be quite frank, I know I'd never use them at any price. Even free.
Spend some time here in the Optics Forum and read what people are saying are superb optics for AR-15's....I think you'll be way better off, as well as not wasting any money.
A rifle is only as accurate as the weakest link in the chain...and with the NC Star stuff it's pretty weak.
Of course that's only my opinion, but read on in here. There's some great reviews and good advice to be had.
Welcome to PM!
Barry