The coupling base may be reused for training and test
c. Coupling Base, Firing Device. Firing device cou-
purposes if the expended primer is replaced. Fifty firing
pling base (see f below) is a knurled metal coupling con-
devices coupling bases are packed in a waterproof car-
taining a percussion primer, improved M3. A blasting
ton, 10 cartons (500 coupling bases) per wooden box.
cap can be attached to the nipple of the coupling base.
The weight of the box with contents is approximately 35
The coupling case is threaded at one end to screw into a
cap well of a demolition charge or certain types of mines.
Figure 1-11.1 - Modernized Demoltion Initiators (MDI) Components.