Enables acetylcholine-gated cation-selective channel activity. Acts upstream of or within regulation of membrane potential. Located in postsynaptic membrane. Part of acetylcholine-gated channel complex. Is expressed in several structures, including diaphragm; embryo mesenchyme; limb bud; skeletal musculature; and tongue. Human ortholog(s) of this gene implicated in multiple pterygium syndrome. Orthologous to human CHRNG (cholinergic receptor nicotinic gamma subunit). [provided by Alliance of Genome Resources, Apr 2022]