900 RPM Submachine Guns are quite sought after in Destiny 2 and Submission is exactly what you are looking for with the new Vow of The Disciple Raid. Here's a guide on how to get this weapon.
Osteo Striga is one of the most popular Submachine Guns in Destiny 2 for which players are finding a God Roll. If you want it too, then check out here for it.