This is a new, Unfired Glock 17L, Gen 5 MOS with many upgrades and additions. 

Upgrades:

*Holosun SCS MOS-GR Green Dot optic: $349.99

 

*Glock GTL 2 Flashlight: $135.56

 

*NDZ Brass Slide Cover Plate: $38.24

 

*NDZ Brass Grip Plug: $33.99

 

*LWD Ext Slide Lock Lever: $9.99

 

So you get a new Glock 17L Gen5 MOS, with 3 mags, case, loader and papers (unopened), WITH $567.71 worth of goodies to go along with it! (Internet prices)