How many mags are with it? Does it have the original box and documentation? How many rounds have been fired through it? Was it carried? The price value can vary so much between guns. A wide price range could be $500 for gun 1 mag with significant wear, whereas a LNIB might run a $1,000 with accessories. Hard to give a good estimate without knowing more info. You can do a Gunbroker search for PD's and see what they range.