Range capabilities of this upper?

http://www.762sass.com/product.php?p=384&cid=1&session=e71cc3f175ab24c8580c1d3ab0bef6a6

What effective range is this good for?

nobody?

You’re asking a question that 1) is far more hinged upon the capability of the shooter than the equipment (i.e., it’s
WAY too broad), and 2) can be answered via the Search functions.