i bought mine for that price a year ago. i've seen them for around $800 once in a while.
mine had a wilson big dot front sight on it. that thing is so big that it covers a 12x12 piece of paper at 100m.
depending on the model it may have different sights on it. heard of one that shyt the bed right after the guy bought it. mine has been flawless for about 1000 rounds so far.
brobe stock adapter fits it fine, and PRI makes a sight rail that attaches perfectly to the reciever holes. first time a mag runs through that gun, the feed lips will get 'machined' a little bit wider. the bolt lugs are just a hair wider than the AR ones. barrel gets real hot with a few mags quickly put through it.
only real complaint for me is there is no bolt stop. you can lose track of the number of rounds left, then just a click.