I've got two Night Finders with no AR's and elastics added. Most accurate and highest range for a Nerf gun I've ever seen. So you can get two guys in one run, except reloading is a pain.
I also had a Buzbee double-shot and I sawed off the barrel so it looked like the Force - A - Nature. This also added a bit of range and it was a much easier gun to carry around.