As you can see in the video below the 9x21mm ammunition do not penetrate the corrugated steel sheds.

http://www.youtube.com/watch?v=ssl6tVKkUk0&t=1m17s

Yesterday I checked the latest developer branch(13-08-2013,EXE rev. 108906), where the ammo penetration values for small caliber weapons was tweeked, but it is still do not penetrate.

In this form the pistol not really useful. {F21411}