Prior to participation in the interlaboratory study, the collaborators attended a 1-week training course in the use of the tested procedure. They then received the test samples and returned to their laboratories to perform the analyses. The tested procedure yielded results with accuracy and precision comparable to that which has been obtained by neutron activation analysis (NAA) for years. Flameless AAS offers advantages over NAA to most forensic laboratories because of its sensitivity for Ba and Sb, ready availability, ease of use, and applicability to other elements, particularly lead. The method used in this study may be used directly or as a method by which to compare in- house methods of gunshot residue extraction and analysis. 2 tables and 5 references