My friends and I were gaming a few days ago and we stumbled upon what seemed could possibly be a big problem. Our GM had given our shaman a Ares Red Line laser, which at first we thought was no problem since the consensus among us is that, at least on paper it's not that great. But, later, when the shaman told the GM that he wanted to quicken a Physical Barrier spell around him did all Hell break loose as we were trying to determine whether or not a laser beam could pass through the barrier.

Two come to mind. One, foolish GM giving out lasers.... Two, hows the shaman going to operate in everyday society with a quickened sphere of barrierness around himself?

Truthfully, I don't think it was quickening the spell actually. Rather, it had something to do with his ally spirit. It was designed so that the spell would not hinder the Shamans everyday interactions. I just said quicken because I couldn't remember what he did. Also, like I said, on paper the Red Line is not that great since it loses power rapidly when the target is a few meters away. The way we all figured it, the GM could just have his NPCs shoot SMGs from short and the laser would be null.

Even without the barrier sickness, the Redline isn't a bad gun at all. Only after 40 meters does the power drop below 8, which is slightly worse than but on par with the other heavy pistols. The only reason it's uncommon to see it used is because the gun itself is effing hard to get and expensive. It's a good gun, just not worth the money or trouble.
As for the question at hand, I would say that the only grounds under which to rule that it doesn't pass through the physical barrier spell are issues of game balance. You aren't going to find a logical reason why it shouldn't work.

~J

Just remember that any attack which penetrates the barrier will bring it down. In most cases, a heavy pistol will do nicely.

Also note that physical barrier spells are clearly visible. If he's got it on during normal, everyday walking around, he will be noticed and likely hassled by the locals and/or cops. (depending on neighborhood)