Primers and Ignition Cartridges for 81-mm Mortar

The red end must be assembled adjacent to the primer (Ref 42, p 86). Ignition cartridge is inserted into fin assembly ahead of the primer. The shaft, in turn, is screwed into the base of projectile, which is made either from pearlitic malleable iron or from steel. Propellant M9 [ See Vol 2, p C35, Table VI (Ref 44)] charge consists of several increments sealed in individual cellophane bags (usually four for 60-min mortars and up to nine for 81-mm weapons). The bags are placed either between or within the blades of fins. 

Primers and igniters for use in 81-mm Mortar Cartridges are of larger size and somewhat different in design. Several types are described in Ref 41, pp 85-8, and they are shown here in Fig 62 

Primer Percussion M7I is similar to M32 M34, except for the exterior shape which facilitates assembling into the hub of the fin of the HE cartridge or smoke cartridge. 

Its head, body and firing plug are made from aluminum alloy, while the closing disk is 

The red colored portion of the cartridge contains a paper flash tube which extends approximately half the length of the cartridge body. The purpose of the paper flash tube is described under Ignition Cartridge M5A1 used in 6Q-mm mortar ammunition. 

---