12.5-20% Critical Chance for 6s on successful Dodge.
12-24% Rending on Enemy Weak Spot Hit for 3.5s. Stacks 5 times.
Critical hit chance scales by your current heat level up to 27.5-50%. Also increases critical ranged attacks damage by 4-10%.
Up to 7.5-20% Strength scaling with Heat Level.
Never reload your gun, let the melee do it. All you have to do is pay attention to your ammo count. You can't blast everything all the time in Havoc so wait for choke points and large groups. Thin hordes and when Elites/Specials are bunched up in the hordes. You should be back line most of the time. Use grenades liberally. Outside of Havoc you can shoot more often.
You can swap Dueling Sword for Sapper Shovel or Rashad Axe but it's not recommended for Havoc 40.
Sapper Shovel
---Flak, Maniac
---Decimator, Uncanny
Rashad Axe
---Carapace, Flak, or Unarmored
---Headtaker, Brutal