The Ring,retaining,optical Element, cataloged under National Stock Number 5855-01-664-4791, is classified within Federal Supply Class 5855 (Night Vision Equipment, Emitted and Reflected Radiation) of the Communication, Detection, and Coherent Radiation Equipment group. The manufacturer of record is Drs Network & Imaging Systems Llc. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Item Name | Ring,retaining,optical Element |
| FSC / FSG | 5855 — Night Vision Equipment, Emitted and Reflected Radiation (FSG 58) |
| Manufacturers | Drs Network & Imaging Systems Llc (CAGE 32865) |
| Parameter | Value |
|---|---|
| NSN | 5855-01-664-4791 |
| Primary Part Number | 1021957 |
| Item Name | Ring,retaining,optical Element |
| FSC / FSG | 5855 / 58 — Night Vision Equipment, Emitted and Reflected Radiation |
| Manufacturer | Drs Network & Imaging Systems Llc |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 1021957 PRIMARY | Drs Network & Imaging Systems Llc (USA) |
| 1021957-101 PRIMARY | Drs Network & Imaging Systems Llc (USA) |
NSN 5855-01-664-4791 is a Ring,retaining,optical Element, manufactured by Drs Network & Imaging Systems Llc, classified under FSC 5855, Night Vision Equipment, Emitted and Reflected Radiation. Status: active.
NSN 5855-01-664-4791 has 2 manufacturer part numbers on file: 1021957 (Drs Network & Imaging Systems Llc), 1021957-101 (Drs Network & Imaging Systems Llc).
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
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.