We already have weapons like that, except BR starts would be more enjoyable. The game mode is so unenjoyable that I already gave up the event as I do not want to keep playing it. Back to better games I go!
Not only this, but it would be great if they used the BTB maps.
This would give a lot more opportunity to revive team mates and make the kill wall relevant.
Ive yet to see the kill wall make any difference, for all intent and purpose its largely useless on the smaller maps
I have seen it make a difference once, and that was just because a single enemy was in a banshee and it killed him.