Description
A special adapter with 1.5" diameter outside threads is required to fit Mk 21 base fuzes in these projectiles. The Mod 7 projectile may also (be) issued Blind Loaded and Plugged or Blind Loaded and Traced with adapter and Mk 5 Mod 1 tracer for target practice.
Functioning
No information about functioning.
See Also
BD, Mk 21 Mod 3
Source(s)
OP 1664, Volume 1 - US Explosive Ordnance (1947)
