Scot, this is a Gen 3 G17 and comes with (2) 17 Magazines. Gen 4 & 5 G17's come with (3) Magazines. Cheers and stay safe!

It comes with 2 mags see *******Glock - 17 - UI1750204B
Firearms
Item #: 904002452
Manufacturer: Glock
Importer: Glock
Model: 17 - UI1750204B
Type: Handgun
Action Type: Semi-Automatic
Caliber / Gauge: 9 MM
Finish: Bronze
Barrel Type: Single
Grip Type: Polymer
Barrel Length: 4.5"
Magazine Capacity: 17
********Magazine Quantity: 2
Case included: yes
UPC #: 792759418907

Best I can tell this is a gen 3, so comes with two 17 round magazines. Hope this helps.