Grand Power P11/MK12/Q1S 9mm 12 Round Pistol Magazine Black GPKPGMAG12-12RD. This magazine fits the GP P11 MK12 only. The durable steel construction ensures a lifetime of flawless function and reliable use. It holds 12 rounds of 9mm ammunition for plenty of capacity and less frequent reloads. Be sure you always have additional rounds at the ready for your MK12 with this extra magazine from Grand Power Specifications for Grand Power P11/MK12/Q1S 9mm 12 Round Pistol Magazine: Manufacturer: Grand Power Gun Make: Kel-Tec Gun Model: Grand Power K100 Mk12 Caliber: 9mm Luger Magazine Capacity: 12 Round Color: Black Quantity: 1 Fabric/Material: Steel Package Contents: Grand Power P11/MK12/Q1S 9mm 12 Round Pistol Magazine What firearm models does the manufacturer say Grand Power P11/MK12/Q1S 9mm 12 Round Pistol Magazine is compatible with? The manufacturer suggests that Grand Power P11/MK12/Q1S 9mm 12 Round Pistol Magazine is compatible with Grand Power K100 Mk12Grand Power GPKPGMAG12-12RD: P11/MK12/Q1S 9mm 12 Round Pistol Magazine Black