Time‐integrated spectra from 177 &ggr;‐ray bursts observed by the Gamma Ray Spectrometer (GRS) on NASA’s Solar Maximum Mission satellite (SMM) have been systematically searched for evidence of emission lines ≥300 keV. The distribution of fitted line strengths is consistent with what is expected from a random sample of data, suggesting that there are no statistically significant narrow or moderately broadened line features in any of the bursts.