This is a 4v4 comp mode suggestion. Arena pistols has players spawning with sidekicks, on the map are thrusters, repulsers, drop walls, and pistols with the plasma pistol and disruptor being placed around the map. The mangler being a center map power weapon spawn.
Arena pistols
start weapon: sidekick
weapons on map: sidekick, disruptor, plasma pistol
power weapons on map: mangler, the explosive disruptor from campaign.
equipment: drop walls, thrusters, repulsers
power equipment: disabled
Grenades: None at spawn
map grenades: dynamo, frags