This means when I get a critical strike I hit with 5x23, gun in perfect condition. That's 115 per hit. It's hitting a little harder than the Anti-materiel rifle. As you can get to almost 100% criticals quite easily it's a give away in the same class as the 'weapon repair kit', another easily achieved resource.
Once you understand how these things affect the game it makes for a much different strategy than seems obvious at first.