sentences:  It paired up two of the weapons on one mount to provide even more firepower with a maximum cyclic rate of fire of 3,200 rounds per minute without requiring much more space than a standard machine gun.Towards the end of the war many specimens were delivered to the army and equipped for use in ground battles with shoulder rest and bipod.The MG 81Z was found in many unique installations in Luftwaffe combat aircraft, such as a pair of MG 81Z (for a total of four guns) installed in the hollow tail cone of the Dornier Do 217.