The Sight Unit, cataloged under National Stock Number 1240-01-691-5155, is classified within Federal Supply Class 1240 (Optical Sighting and Ranging Equipment) of the Fire Control Equipment group. The manufacturer of record is Lightforce Usa, Incorporated Div Mil-Gov-Le. Government technical data includes 8 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 | 1240-01-691-5155 |
| Primary Part Number | M621 |
| Item Name | Sight Unit |
| FSC / FSG | 1240 / 12 — Optical Sighting and Ranging Equipment |
| Manufacturer | Lightforce Usa, Incorporated Div Mil-Gov-Le |
| Status | ACTIVE |
| Diopter Scale | INCLUDED |
| Magnification Type | VARIABLE |
| Optical Device Type | LENS |
| Focusing Type | ADJUSTABLE |
| Field View Coverage | 4X: 26.9 FT; 16X: 6.9 FT FT |
| Objective Aperture Diameter | 50.0 MILLIMETERS NOMINAL MM |
| Scale Markings | PROVIDED |
| Straight Type Overall Length | 13.1 INCHES NOMINAL IN |
| 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 |
|---|---|
| M621 PRIMARY | Lightforce Usa, Incorporated Div Mil-Gov-Le (USA) |
NSN 1240-01-691-5155 is a Sight Unit, manufactured by Lightforce Usa, Incorporated Div Mil-Gov-Le, classified under FSC 1240, Optical Sighting and Ranging Equipment. Status: active.
NSN 1240-01-691-5155 has 1 manufacturer part number on file: M621 (Lightforce Usa, Incorporated Div Mil-Gov-Le).
Key specifications for M621: Diopter Scale: INCLUDED; Magnification Type: VARIABLE; Optical Device Type: LENS; Focusing Type: ADJUSTABLE. 8 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.
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.