TarkovHead

While the quest states that "I'm not going to count any other setup" you may customise the RPDN as much as you'd like as long as it has the 1P78-1 scope. The kills acquired will count regardless of other attachments. This means you may add the RPD DS ARMS Railed Handguard along with an NcSTAR MPR45 Backup mount and/or a compact collimator/laser module of your choice.

Because of the high weight, the weapon will always overswing. Point firing will be more useful in close engagements and using the 2.7x scope will be more advantageous at ranged encounters. The kills required do not specifically need to be any faction. So you may find it advantageous to go to a map you need other progression on.