
This tracer is self-destroying, containing an igniter pellet of 6 grains of black powder and a 5.7 gram self-destroying black powder pellet. When the tracer illuminant has burned through, the igniter pellet is fired, initiating the self-destroying element, which, in turn, explodes the projectile.
Setback forces the primer carrier back, bending the ears on the stirrup spring and bringing the primer against the fixed anvil. The flash from the primer ignites the tracer starter, which initiates the tracer illuminant.
No information about hazardous components.
Nothing else to see.
OP 1664, Volume 1 - US Explosive Ordnance (1947)