Looking for Help on two parts of the Tutorial

In the FPS Tutorial provided in the wiki I have been working my way through it, everything was running smooth with a few minor hiccups. However once I reached the projectile section and the crosshair section I am completely lost. Neither seem to work properly. For instance the collision on the static mesh box works with my pawn however the projectile actor continues to pass through everything with no change. I keep getting errors with the crosshair section. It just doesnt work. Has anyone else run into this problem, if so have you fixed it?

Thanks

B