
The fuze, used in the cartridges M406 and M407A1, is a second-generation, long arming delay fuze which employs setback and centrifugal forces to accomplish arming. It has minimum and maximum arming distances of 14 to 27 meters, respectively.
No information about functioning.
Cartridge, 40mm Practice, M407A1
TM 9-1385-51, Ammunition (Conventional) for Explosive Ordnance Disposal (1967)