Seriously, with the right perks and attachment, this baby can be abused to its finest rape sensation from close to medium range.
Such said perks and attachments would be (in my opinion) Steady Aim, along with the attachments range and rapid fire.
The PM-9 already has the highest fire rate as an SMG of 1000 RPM. Combining rapid fire with the gun will turn this gun into a deadly mini-machine gun,
My second consideration for attachments would be the double attachment with rapid fire and extended mags if you're one to spray.
Just hip fire. It bests the iron sights by far from close to medium range.
Check out the video guide for the gun on Elite TV, which can be watched here on my thread:
The guy just hip fires all the time. The gun is absolute beast and it matches up (or even surpasses) the FMGs. It's funny when I get people bitching and complaining to me about how the gun is OP, yet a vast majority looks down on it.
Use it right, and use it well.