DLMS™ Summary National Stock Number 1020-00-131-2923 National Stock Number (NSN) 1020-00-131-2923, or NIIN 001312923, (ring,piston) has an unknown assigned date. NIIN 001312923 was cancelled on January 1, 1963, with a cancelled status of "Item is Cancelled as Duplicate." This NSN was replaced by NSN 4310001735275. This NSN does not replace any other NSNs. There are no manufacturer part numbers associated to this NSN. This part number has not been procured by the US Government in over 5 years. There is no data in the HMIRS and the NSN is in an FSC not generally suspected of containing hazardous materials. NSN 1020001312923 does not contain precious metals. This information was last updated on May 04, 2012.