In honor of Natasha Kerensky, I present the Widowmaker. I hope there's enough ammo, and I struggled to get it over 20% heat efficiency, but as long as you don't alpha, I don't THINK you'll overheat. Use at your own risk, I have not given this any time in the field. This is a purely theoretical build to see if I could do it.
The true Widowmaker in all her glory. cant wait for the DWF-W to go on sale for C bills to give it a spin. Would move ammo to leg for added protection