Mec-Gar USA Magazine, 22LR, 10 Rounds, Fits Ruger MKII, Blued Finish MGMK22LRB 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.