3.5-5% Strength for 3.5s on Hit. Stacks 5 times.
Up to 5-20% Strength based on the charge time of your heavy attacks. Stacks 3 times.
5-8% Strength for every 10% of magazine spent during continuous fire. Stacks 5 times.
Direct hits apply 1-4 Stacks of 1% Brittleness for 5s. Stacks 20 times
My typical hammer/flamer build. It's quite strong all around, if you can get used to the cadence of keeping knives in stock. It of course absolutely deletes monsters.