View attachment 316465
Seriously, you need to do some research. Check the different websites, NRA Gun Collector Guide, Blue Book of Gun Values.
Don't rely just on the old "Blue Book" cause I never met anyone that had a gun bought by that book. Plus they over an average price estimate and their information maybe a bit stale given our current market situation.
And keep a sense of humor because you'll meet plenty of the "My Shit is Gold but your Shit is Shit" types
Used GLOCK =$350
Used, but fresh night sights installed=$50
Total =$400