The misunderstood middle child of the SMG family, the UMP45's small magazine is the only drawback to an otherwise versatile close-quarters automatic.
Damage chart
Toggle Kevlar and Helmet
The UMP-45 is a great weapon in force-buy scenarios with its high armor penetration, as well as being a cheap alternative for anti-eco rounds.
Learn the spray patterns
Trace the loop on the right for a perfect spray!

Uncontrolled spray (courtesy: twowordbird)

Controlled spray
The UMP-45 has a relatively simple spray pattern, and when controlled, the damage output and time-to-kill is almost at the level of the CT rifles. A good way to remember the pattern is that it is a 'mirror' of the AK-47's pattern!
See it in action!