Used yes I think that is a bit steep. Closer to $600 would be more reasonable. The 4 mags instead of 2 certainly helps but still a bit high in my opinion. That front sight might of intentionally been removed as some shooters prefer an all black front post to a white or tritium dot although most would simply use a permanent marker to blacken it out instead of removal. If it is in good shape other than the sight I would offer $575 and consider $600 as the top end in consideration of those extra mags.