Mec-Gar USA Magazine, 9MM, 18 Rounds, Flush Fit, Fits GLOCK 17, Anti-Friction Coating, Black MGG171800A MEC-GAR magazines meet or exceeded the tolerance guidelines, stringent testing and exacting requirements of military and law enforcement customers around the world. MEC-GAR incorporates the highest level of quality control measures during the manufacturing process and critical dimensions are regularly checked to maintain tolerance specifications.