Similar way to how melee human sword adept does consistently assault rifle damage with his weapon foci katana before adding in hits. Str+3+1(for crit strike blades) = 10 (6+3+1) dv with AP -3. If I use my claymore (flavored as a nadochi) its 12 dv AP -5 pre hits. Combining that with high initiative, max racial agility, and more than one occasion surprise, things die.
As for why range weapons, Mr melee troll, meet FN-HAR loaded with ADPS and long full auto bursts, SnS, or EBR using bullseye double tap 3 blocks away. Not everything can be solve with melee, even for melee adepts.