
This primer is exactly like the Percussion Primer Mk 21, except that it is secured by a push fit rather than threads. The Mk 22 is used in 40mm Brass Case Mk 1 and Steel Case Mk 3.
No information about functioning.
No information about hazardous components.
Nothing else to see.
OP 1664, Volume 1 - US Explosive Ordnance (1947)