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This is you one-stop-spot for all thing Battlefield. From 1942 to Bad Company 2 and beyond, this is a great place to meet other players, talk matches and even recruit new clan members.
The PKM is great, but not a really threatening weapon. the rate of fire is slow, but the damage is much more than the M249. The good thing about the PKM for me is the accuracy and the rate of fire doesn't make me miss shots as much as the M249.
The 870 is a great gun but the recoil hits hard. It kinda balances out the ONE HIT KILL capability when you get close. I like to use it as a sniper class because people get closer to you thinking that they can get an easy knife kill.