This build is absolutely fantastic for doing bounties on Orb Vallis. It is also great to use as an archgun deployer on high level steel path Corpus missions. It takes out robotic and flesh enemies equally. The increased impact damage helps churn through shields in one or two shots. I have extensively tested many different variations and different damage types. In general, radiation and viral damage work best together. Viral has no knockdowns against shields and dispatches flesh enemies with ease with a 50% bonus. Radiation has 25% bonus against robotic health and 75% bonus against alloy armor (which many corpus units carry). Impact has a 50% bonus against shields. I know what you are thinking, but radiation and toxin simply does not work as well as radiation and viral on most of the weapons I have tested. I really wouldn't suggest any changes to this. Increasing radiation or viral won't improve performance. [Comet Blast] works best as opposed to [Sabot Rounds] or some mod increasing the two elemental damage types. Even though the status chance is 26% it still procs constantly. I guarantee you won't regret adopting this build. Enjoy!