The magazines that are available hold 10 or 25 rounds of 45 ACP ammunition. Advertised cyclic rates are 580 rpm with 230 grain ball, and 700 rpm with 185 grain +P ammunition.
In .40 caliber and 9mm, the UMP magazines hold 30 rounds. The .40 caliber UMP is for sale in the United States. The notable difference between the .45 and 9mm UMP is that the 9mm has a curved clip while the .45 has a straight clip.
One of the greatest features of the largely polymer design is the weight, or lack of it. The UMP only weighs 4.63 pounds empty!
UMP45 Specs
Caliber .45 ACP
Cyclic Rate 600
Mag Capacity 25
Mode of Fire S/2/F
Width (in.) 2.5
Height (in.) 12.83
Weight (lb.) 4.93
bbl. length (in.) 7.87
Overall Length (in.) 27.17
UMP45 Being Fired
UMP With Attachments
Picture of the UMP45 with a silencer, tac light and scope on it.