M313 Training Insert

The M313 Training Insert is a sub-caliber insert used to reduce the life cycle training costs of the M120/M121 Battalion Mortar System by approximately $33M per year. The M313 will replace the M303 insert. The M313 is capable of firing the 300 series and newer 800 series 81mm ammunition. The M303 is restricted from firing the 800 series ammunition due to higher pressures generated during firing.

The M313 consists of an 81mm mortar tube similar to the current M253 tube, a spacer, and a mock 120mm tube which allows access to the 81mm tube’s firing pin. The system uses the breech cap from the tactical 120mm tube to provide more realism in training.

The M313 retains all the performance characteristics of the M253 81mm mortar tube used with the M252 mortar System. The M313 is approximately half the cost of the M253, weighs 4.5lbs. Less, and incorporates an Internal blast attenuation device, reducing the number of parts and simplifying maintenance and operation.

General Information

Physical Characteristics