The PM9 is a very strange sub machine gun in MW3. It has by far the worst accuracy of any weapon in the game outside of maybe the G18. The view kick, recoil, and overall accuracy are very low. The damage if fairly low and it has the effective range of the KSG12. However, this weapon fire incredibly fast. The PM9 is the fastest firing weapon in MW3 (aside from akimbo machine pistols). If you play to it's strengths and hip fire a lot, you can kill a lot of people. However, it really isn't a recommended weapon.