My standard use for Death Machine Rifle Prime. Low status chance means that you can swap out for any element without a noticeable lack in firepower. Ultimately, I find that without a powerful Riven any sentinel weapon will drastically lose effectiveness at higher levels but I have little issue with this setup.
The high RoF is to try and counter the low crit chance, and while Galvanised Chamber could be used, I don't think that Player kills contribute to it nor does the DMR make sufficient kills to make use of the Galvanised variant