MIL-P-63438 1981 Edition, November 4, 1981
PROJECTILE, 20MM, TARGET PRACTICE, M55A4B1
Includes all amendments and changes through Cancellation Notice 1, October 3, 1997
Additional Comments: CNCL NO S/S
This specification covers the projectile metal parts for Projectile, 20MM, Target Practice, M55A4B1 manufactured from bar stock by impact extrusion with steel nose cap.