Enables transmitter-gated ion channel activity involved in regulation of postsynaptic membrane potential. Predicted to be involved in several processes, including GABAergic synaptic transmission; chloride transmembrane transport; and gamma-aminobutyric acid signaling pathway. Is active in GABA-ergic synapse. Is integral component of synaptic membrane. Is expressed in brain and lens. Orthologous to human GABRG3 (gamma-aminobutyric acid type A receptor subunit gamma3). [provided by Alliance of Genome Resources, Apr 2022]