The Sight,thermal, cataloged under National Stock Number 5855-01-540-1835, 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 Night Vision Systems, Llc. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5855-01-540-1835 |
| Primary Part Number | M820 |
| Item Name | Sight,thermal |
| FSC / FSG | 5855 / 58 — Night Vision Equipment, Emitted and Reflected Radiation |
| Manufacturer | Night Vision Systems, Llc |
| Status | ACTIVE |
| Overall Diameter | 3.125 INCHES NOMINAL IN |
| Special Test Features | UNIVERSAL WATERPROOF NIGHTSCOPE. COMPATIBLE WITH POWERED SCOPES AND POWER SIGHTS. INSTALLS AND REMOVES WITHOUT THENEED FOR BORESIGHT ADJUSTMENT. ADDS NIGHT CAPABILITY TO EXISTING RIFLE AND DAYSIGHTS. |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL D — Destroy Item |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| M820 PRIMARY | Night Vision Systems, Llc (USA) |
NSN 5855-01-540-1835 is a Sight,thermal, manufactured by Night Vision Systems, Llc, classified under FSC 5855, Night Vision Equipment, Emitted and Reflected Radiation. Status: active.
NSN 5855-01-540-1835 has 1 manufacturer part number on file: M820 (Night Vision Systems, Llc).
Key specifications for M820: Overall Diameter: 3.125 INCHES NOMINAL IN; Special Test Features: UNIVERSAL WATERPROOF NIGHTSCOPE. COMPATIBLE WITH POWERED SCOPES AND POWER SIGHTS. INSTALLS AND REMOVES WITHOUT THENEED FOR BORESIGHT ADJUSTMENT. ADDS NIGHT CAPABILITY TO EXISTING RIFLE AND DAYSIGHTS.; Overall Length: 9.500 INCHES NOMINAL IN; Special Features: OBJECTIVE LENS: 120 MM; FOCUS RANGE: 20 M TO INFINITY; SYSTEM MAGNIFICATION: UNITY; DETECTION RANGE: (1/4 MOON/PERSON) 1000 METERS: POWER SOURCE: BATTERY, AA, 2 EA.; OPERATING TIME: 48 HOURS; MOUNTING: QUICK ATTACH/DETACH TO MIL-STD-1913 (PICATINNY) RAIL: WEIGHT: 51 OUNCES. OZ. 2 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 5855-01-540-1835 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.