5 Forma and catalyst Prisma Gorgon Against Grineer, Corpus, and Infested. All builds focus on maximum base damage (except not fully maxed heavy caliber) and critical delay to increase ammo economy while boosting critical chance. you can decreased elemental damage slightly and switch it with hammershot for more crit damage though, if you are looking for very high dps and do not worry about significant ammo loss.
if you don't like the music, you can always just mute the video. there isn't any commentary anyway.