US Primer, Electric and Percussion, Mk 15 Mod 2, 3
This primer is used with a variety of separate loading ammunition rounds to initiate burning of the propelling charge. The primer can be activated either by percussion from a firing pin, or by an electric current.
Primer Mk 15, Mods 2 and 3, is a brass cylinder with an extraction flange base. A charge container loaded with 30 grains of black powder is threaded into the case. The base contains a firing plunger assembly, a primer cap of sensitive primer compound, and an electrical resistance wire embedded in gun cotton, The plunger assembly is insulated electrically from the case, except for the resistance wire connecting the two parts.
Nothing else to see.