The Periscope Subassembly, cataloged under National Stock Number 1240-01-398-9877, is classified within Federal Supply Class 1240 (Optical Sighting and Ranging Equipment) of the Fire Control Equipment group. The manufacturer of record is L3 Technologies, Inc. Div L3 Keo. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 1240-01-398-9877 |
| Primary Part Number | 1979724 |
| Item Name | Periscope Subassembly |
| FSC / FSG | 1240 / 12 — Optical Sighting and Ranging Equipment |
| Manufacturer | L3 Technologies, Inc. Div L3 Keo |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL D — Destroy Item |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 1240-01-398-9877 is a Periscope Subassembly, manufactured by L3 Technologies, Inc. Div L3 Keo, classified under FSC 1240, Optical Sighting and Ranging Equipment. Status: active.
NSN 1240-01-398-9877 has 2 manufacturer part numbers on file: 1979724 (L3 Technologies, Inc. Div L3 Keo), 1979724 (Northrop Grumman Systems Corporation).
1 possible match (shared part number, not a government interchangeability claim): 1240-01-429-0255. Verify interchangeability with system specifications before substitution.
Key specifications for 1979724: End Item Identification: TY8J MOD3 PERISCOPE. 0 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 1240-01-398-9877 has DEMIL Code D. Demilitarization may be required before disposal or transfer to non-military entities.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.