
Point detonating fuze M519 which is a combination of PD fuze M52A2 and fuze adapter T211 for use with 81mm cartridges, is a single action type with a direct action firing device.
No information about functioning.
MIL-HDBK-146, Fuze Catalog (1982)
TM 9-1300-203, Artillery Ammunition (1967)
TM 9-1385-51, Ammunition (Conventional) for Explosive Ordnance Disposal (1967)