Enough people have told you that you can put a collapsible stock on these, that I feel the need to chime in.
The threads for the buffer tube are metric, not a big deal if you're sticking with rifle stocks, just put the stock on using the Norc buffer tube and screw. Now, if you want to put on a collapsible stock you can, but you'll have to use one of two different methods;
-Have a 'smith, or someone with the proper tap, rethread it for you. Not a great choice if your main reason for buying one of these because of the price.
-Force the new buffer tube on, essentially rethreading it. Hopefully it threads on straight.
So as you can see, it can be done, but it's not a simple swap like some people seem to be implying.
If you really want an AR than I'd shop around. Bargains can be had. The last AR that I bought was the same style as a CQ 311 (M16A1 type) and I paid $900 for it. Upper receiver and barrel are GI, lower is PWA. Colt SP1's come up for sale all the time, sometimes the asking price is pretty reasonable.
ETA: If all you're looking for is an old school M16A1 type clone, than by all means, buy the Norc. If you ever get the urge to tweak it, sell it and buy a good brand lower and upper. I'm not knocking the Norcs, I love my M305, and I'm even tempted to pick up a CQ 311, but that's because I dig the retro look and It would be a good base for a partial fence shorty carbine.