National Stock Number
1055-01-554-4915
National Stock Number (NSN) 1055-01-554-4915, or NIIN 015544915, (breech mechanism) was assigned August 10, 2007 in the Federal Logistics Information System (FLIS). NIIN 015544915 was cancelled on December 18, 2018, with a cancelled status of "Item is Cancelled - Inactive." There is no known replacement specified for this stock number. This NSN does not replace any other NSNs.
There are 2 manufacturer part numbers associated with this NSN. None of the associated part number(s) are considered obsolete. The manufacturer part numbers were originally supplied by one supplier. Today, one supplier is listed as an Active supplier for this NSN. Of the active suppliers, there are no suppliers that are deemed design controlled or valid supply parts.
This part number has not been procured by the US Government in over 5 years.
This NSN is assigned to Item Name Code (INC) 35283. [A GROUP OF ITEMS THAT FUNCTION TO OPEN AND CLOSE THE BREECH. IT MAY INCLUDE A SEMIAUTOMATIC DROP BLOCK, CASE EXTRACTION, AND ELECTRIC FIRING. IT MAY PROVIDE MANUAL AND/OR AUTOMATIC OPENING OF A BREECH, EJECTION OF SPENT CARTRIDGE CASE, AND AUTOMATIC CLOSING WHEN CHAMBERING THE NEXT ROUND.]. This item does not have a nuclear hardened feature or any other critical feature such as tolerance, fit restriction or application. There is no data in the HMIRS and the NSN is in an FSC not generally suspected of containing hazardous materials. NSN 1055015544915 does not contain precious metals.
This information was last updated on Aug 01, 2025.