ULTIMAG G17 - 18 round 9x19mm capacity. Product Advantages: 18 round 9x19mm capacity Two enclosed floor plates Concealable base plate installed; tactical floor plate included Visual indication of even rounds from 4 to 18 No tools needed for disassembly Multi-textured surface for enhanced grip Impact and crush-resistant reinforced polymer Multiple colors available Also available in limited 10-round 9x19mm capacity (ULTIMAG 1710R) Compatibility: Glock: G17, G17L , G19 , G19X , G34 , G45 , G47