I don't that you understand what I mean, I mean the gun has a sight to view through walls and shot up to 5 meters through the wall. Correct me if I'm wrong, but that's what I have seen so far. Not every gun can shot through walls.
FTB Launcher version: 1.0.4
Minecraft Version: 1.4.2
Java version: 1.7.0_09
Detailed description of the issue / how can the issue be recreated: Start the launcher, don't see mod/map packs.
Error logs: http://pastebin.com/abspnwsT