There is nothing wrong with the PKP, all of the LMGs are good now that they removed damage dropoff. If they were going to add a gun it wouldnt be in the least used gun class. They have never added a gun post release and they aren't going to at this point.

Asking ACTIVISION to put in new weapons into their game is like asking a child to give you their favorite piece of candy. It's NOT going to happen.

While I love the RPD, if you can see past what you were good with you can get better with what is available.

I didn't touch LMGs because they didnt have the RPD, but I got bored with only playing one type of style I decided to pick a LMG up.

The MK46 is beastly and I dont have to change the sights.  I mow people down.  I don't get my usually KD but its extremely fun.  I can win more 3 on 1s from a distance instead of 1 on 1, even mid-range and close range more often.

Try it out, I think you would like it.