Talk about them here.
http://www.hasbro.com/nerf/en-US/
Some links to modifying:
http://nerfhaven.com/forums/index.php?act=idx
More power to the vulcan:
http://au.youtube.com/watch?v=dokbdPPqkFU
Also, target are the ones that seem to be reliable on having Nerf gear in, and the refill darts too.
And everyone should have a nitefinder. Easy to get, easy to mod, fun to use, and just ~$10.