PERISCOPE M13 NSN:6650-00-759-7754 P/N：7643904 PERISCOPE M17 NSN:6650-00-704-3549 P/N：7043549 PERISCOPE M27 NSN:6650-00-344-4643 P/N：7633132 PERISCOPE M37 NSN:6500-00-856-9455 P/N：8635100 PERISCOPE M45 NSN:6650-00-509-2743 P/N：8213430 PERISCOPE M1 NSN:1240-01-080-8004