You haven't been watching the OP Kraco.

It's a lightsaber, and just like any lightsaber, it can deflect blaster bolts. And apparently bullets. I guess it vaporizes the latter.

Since the two are obviously going to end up in some kind of team arrangement, Kirito uses his Mary Sue powers to cause havoc on a massive scale downrange, and Sinon covers him from snipers or others attacking his blind spot.