First to first, there's a list of the official Capcom blog with the original real-life models of the DLC weapons of ORC, for the some users who don't understand: http://www.capcom-europe.com/blog/2012/01/16/
Second, ORC didn't include some notable weapons of RE2 and RE3, specialy heavy weapons like rocket launchers and replacing some of the original models of the real life guns with new designs.
What weapons do you want as a DLC? We know Capcom, is inevitable new DLCs for the game...
Well, I want a HEAVY POWERFUL PACK WITH:
1.- Anti-tank weapon (aka RPG-7)
2.- Bowgun (aka Crossbow)
3.- Hancannon (aka S&W M500)
4.- Six shooter (aka Colt Python)
5.- Grim Reaper (aka M202A1)
6.- Militia sniper rifle (aka Dragunov SVD)
7.- Rocket launcher (aka FIM-92 Stinger)
8.- Gatling gun (aka M134 Minigun)