I got a Nerf double barrel shotgun for my 18th birthday and everyone instantly regretted me having a nerf gun, I've used it for nothing but annoying people.
The Barrel Break? thats a really cool gun. its range kinda sucks, but for indoors its a really nice gun.
It's essentially a sawed-off shotgun, you couldn't really expect any better.
Anyway, in a similar fashion to what Flame's school does, my boy scout troop does a Nerf lock-in every year at my old private school (on account that one of my troop's committee members actually works at said school), but it saddens me that the place is so small that the gymnasium is the only place to have large team battles. Now if my high school would be on board with the idea...
As for what I actually have, I did purchase the Zombie Strike Slingfire lever-action gun a few months back, for the sole purpose of learning how to spin-c0ck it Terminator-style. Unfortunately, that turned out to be a disappointment.