Elite Force HK UMP 110rd Mid-Cap MagazinePack of 5 Black. Treat yourself to a 5-pack set of our 110-round mid-cap magazines for your HK UMP AEG. The mags are sturdy made of high-quality polymer and ready for action (no winding necessary). Specifications for Elite Force HK UMP 110rd Mid-Cap Magazine: Manufacturer: Elite Force Color: Black Fabric/Material: Plastic Magazine Capacity: 110 Round Projectile Caliber: .243 Caliber Package Contents: Elite Force HK UMP 110rd Mid-Cap Magazine Elite Force 2278059: HK UMP 110rd Mid-Cap MagazinePack of 5Black