Every gun is a BFG.

[Raikoh_Minamoto]

... or something not unlike a BFG. I'd try to do this myself, but I'm so inexperienced that it's not even funny. Still, think about it for a sec:

Pistol: ?
Shotgun: Christmas BFG
Chaingun: Lightning Gun, from Quake (it'd probably be a bitch to actually implement, though)
Rocket Launcher: BFG 314 (from the movie)
Plasma Gun: BFG 10K from Q3A (only weakened... don't want to outshine the star of the show)
BFG 9K: Uh, BFG 9K!

[leileilol]

george locmel did this already i believe

[deathbringer]

The Lightning Gun from quake could alternatively be the BFG2407 from the press release Beta, as it's "doomy". It'd need a new sprite though. The pistol could shoot the red shots from it one at a time

[chilvence]

I actually made some particle lightning for zdoom once...

http://forum.zdoom.org/potato.php?t=4784&postdays=0&postorder=asc&highlight=lightning&start=15

[deathbringer]

So somebody DID code another weapon that used particles and wasn't the railgun!

[chilvence]

It never got added though, so what was the point :) ?