Yeah, this is especially useful in games of CTF or Assault. When they're escaping with the flag or making a run for your base you fire a charged shot and they stop dead in their tracks. A couple grenades can finish them off.
Wow, that's actually really cool. I should look into some Marine or ODST armor... Well done so far. After it's finished I think you should get some paint and give it a nice paintjob. Again, looks good. :D
Lol, that's funny, I remember playing that game still. Goldeneye is the best pre-2000 shooter to play 4-player. LOL!
And yeah, that gun looks kinda like the Spartan Laser, but it's nowhere near it in size.