FOR [Rhino] or any frame with an iron skin or something like that.
i use this weapon since 5 months now with this exact build.
People who cross me ingame "Skull Company" know how it's efficient and crush everything even after hours of survival against anything.
Into your warframe you need to add : Arcane Awakening to add +150% damage for secondary.
The HEAT + VIRAL is one of the most deadly combo against anything into the game.
- Galvanized Diffusion will help to add damage
Magnum Force is very efficient (you do not care about accuracy with this weapon)
into your Sentinel add : [Vigilante Supplies]
Doing this + [Pistol Ammo Mutation] you will never need any [ youtube id="ammunition" ]
This is the best secondary weapons for me into the game.
Using this build with a Rhino or any iron skin / shielded frame type will gives you enjoyment and fun and will put your DPS on the top of the list without any skills.
IF you add the Helminth skill : Eclipse on your [Rhino] you will get a DPS no one can match even [Mirage] herself.
ROAR + Eclipse + [Akarius] = Death to anything.