
The Range Signal M27 is similar to the projector-type signals, except that it has no tail assembly. It is fired only from the Ground Signal Projector M1A1. The signal explodes at the top of its rise, producing a flash and a puff of smoke.
No information about functioning.
Nothing else to see.
OP 1664, Volume 1 - US Explosive Ordnance (1947)
TM 9-1904, Ammunition Inspection Guide (1944)