I have a NcStar 4x30 scope that I used a few times. It comes with lens covers and scope rings for picatinny/weaver rails. This was on my AR-15 and is accurate at 100 yards and holds a zero well. The first $30 (o.b.o) takes it, FTF sale in Philly area, if you want it shipped you'll have to pay for it. PM me if interested.
Here's a stock photo of the scope taken from the NcStar website:
http://www.pafoa.org/forum/imagehost...3322ceb84d.jpg