9MM AR15 RRA Upper and DPMS lower with magblock adapter *

I have a 9mm ar15 for $800 with 3 mags. It has a Rock River Arms 16" Carbine A2 Upper and a DPMS lower with mag block installed for Colt 9mm Mags. Here are a few links to some of the cheaper mags I have found.
http://www.aimsurplus.com/product.a...teel+32rd+Mag&groupid=301&search=9mm+magazine
http://www.knesekguns.com/commercial/Beta-Company-C-Mag-Colt-9mm

I'm willing to sell the upper, magblock, and 3 magazines for $600.