MIL-STD-1168C
approved as reference lots shall be identified by replacing the hyphen between the lot interfix number and the lot sequence number with a capital letter "R." The appropriate manufacturer's identification symbol, year of production code, and month of production code remain consistent with the pertinent provisions of this standard. At no time shall the same manufacturing activity duplicate a reference lot sequence number even though the type of material involved is different. The specific requirements for the three categories
of reference lots are described below with associated examples:
a. For ammunition reference lots up to and including .50 caliber, the lot sequence number shall be used to identify in sequence the number of reference lots produced by the manufacturing activity identified with the manufacturer's identification symbol. The interfix number shall be the number "000."
Example for ammunition up to and including .50 caliber:
1st reference lot: AB-12L000R001
2nd reference lot: AB-13B000R002
3rd reference lot: AB-13D000R003
b. Ammunition above .50 caliber (component or end item lots) approved as reference lots shall keep their original interfix.
Example for other than small arms ammunition:
Lot LLL13D031-009 was selected and approved to be a reference lot. The revised lot number becomes LLL13D031R009.
c. A propellant lot approved as reference lot shall be identified by replacing the character immediately after the hyphen in the propellant lot number with a capital letter "R."
Example for propellant lots:
M1 propellant lot XYZ11C-071984 was selected and approved to be a reference lot. The new number becomes XYZ11C-R71984.
The revised lot number shall be applied directly to the ADC and all appropriate
controlling documents. Any detailed comments shall be made in the remarks block of the ADC concerning reference lots. As a minimum, the new lot number shall be marked on all external packages or cartons, and if necessary, applied directly to the individual units for identification purposes (see 6.3). Ammunition designated as reference lots shall not
be issued for field use nor flow into the regular supply stream without special and specific authorization.
4.7.8 Special lots. (The "S" lots.) Certain lots of ammunition are manufactured for specially expressed purposes, such as proving ground tests, special requirements, special tests, engineering tests, etc. Generally they are not intended for use as service or training ammunition. These "S" lots shall be numbered consecutively regardless of type
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