Since murmur was such a popular weapon due to its ability to change weapon elements they should have weapons like this maybe an pulse rifle that changes into a scout rifle its a good idea I mean the Ripper from CoD Ghosts was very popular. This would be awesome for PvP or PvE think about it both weapon variations would be amazing both could have its own various perks an upgrade paths like the pulses perk would be 4 bullets bursts per shot an missing a shot has a chance to burst a 5th shot an the scouts perk could be this weapon sometimes shoots two shots at once this weapon would be exotic of course but I thinks it's a great idea.