Buzzsaw, yes it is, daggers top it easily in terms of acquisition and upgrades (also I think I had those and the buzzsaw at same time)
Honestly upgraded thin dagger (and if you can get and upgrade - double-dagger) are just OP which makes ranged weapons feel useless by comparison.
Launcher - gonna stop trying for it and try the twin flamers thing now, but with how slow flame weapons are I don't feel its gonna work.