When fields start allowing vehicles in play, companies will start producing weapons to mount on them... until then, who wants to do battle drills with an M2 or Mk19? All joking aside though, the killbuckets designs I have seen all looked very good. The one I saw in person had an A&K gearbox with upgraded internals firing from a modified ammo can style magazine, and had an amazing rate of fire and range. It also had some type of amplifier built into the barrel, with a quite loud, distinctive pop to it. No clue what the end cost was, but the product was a lot of fun to have on the field.