Receptor for the Fc region of complexed immunoglobulins gamma (PubMed:1692135). Low affinity receptor which binds to IgG1, IgG2a and IgG2b (By similarity). Mediates neutrophil activation by IgG complexes redundantly with Fcgr4 (By similarity). May form multisubunit complex with other heteroproteins. This association is required for efficient cell-surface expression. Does not associate with CD3 zeta. Additional isoforms seem to exist. Expressed on natural killer cells and macrophages.