Ghost Inc Magpul PMAG 17 9mm +6 Rounds Rifle Magazine Extension Black 6. Specifications for Ghost Inc Magpul PMAG 17 9mm +6 Rounds Rifle Magazine Extension: Manufacturer: Ghost Inc Color: Black Magazine Capacity: 6 Round Gun Make: Glock Gun Model: Glock 17 Package Contents: Ghost Inc Magpul PMAG 17 9mm +6 Rounds Rifle Magazine Extension What firearm models does the manufacturer say Ghost Inc Magpul PMAG 17 9mm +6 Rounds Rifle Magazine Extension is compatible with? The manufacturer suggests that Ghost Inc Magpul PMAG 17 9mm +6 Rounds Rifle Magazine Extension is compatible with Glock 17Ghost Inc GHOPM176MOABBLK: Magpul PMAG 17 9mm +6 Rounds Rifle Magazine Extension Black