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Scenarios in which right-handed light Standard Model fermions couple to a newgauge group, $U(1)_{T3R}$ can naturally generate a sub-GeV dark mattercandidate. But such models necessarily have large couplings to the StandardModel, generally yielding tight experimental constraints. We show that thecontributions to $g_\mu-2$ from the dark photon and dark Higgs largely cancelout in the narrow window where all the experimental constraints are satisfied,leaving a net correction which is consistent with recent measurements fromFermilab. These models inherently violate lepton universality, and UVcompletions of these models can include quark flavor violation which canexplain $R_{K^{(\ast)}}$ anomalies as observed at the LHCb experiment aftersatisfying constraints on $Br(B_s\rightarrow\mu\mu)$ and various otherconstraints in the allowed parameter space of the model. This scenario can beprobed by FASER, SeaQuest, SHiP, LHCb, Belle, etc.

Explaining $g_{\mu}-2$ and $R_{K^{(*)}}$ using the light mediators of $U(1)_{T3R}$