This is a TangoDown Tool known as the Vickers Tactical, model GGT01.
A stainless steel takedown tool (similar to Factory Glock tool) is conveniently stowed in the pistol grip cavity" enabling the shooter to field strip the weapon for proper cleaning and maintenance. Access to the tool is easy just remove the magazine" lock the slide back and pull the tool free from the pistol grip. The GGT01 acts as a ramp and a positive index point for rapid" accurate magazine insertion.
Features:
Corrosion Resistant
Easily Removed by Hand or Stripped with Magazine Floorplate
Enables Quicker Speed Reloads