Looking at it from the game stats perspective, I.too think the -1 was intended. The way I see it, each gun should have a niche, something you might want to use it for over other guns. Apart from the sbd-44 (which is supposed to just be bad, as a vintage gun) and the rain forest carbine (which makes little sense as written in the book), I think the GH3 weapons achieve that. The Monsoon has very high ammo capacity, and the inception and kriegfaust are more accurate than the average assault rifle.