The Sight,bore,optical, cataloged under National Stock Number 1240-01-654-5246, 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 4 specifications, cited from the U.S. Government catalog. The record lists 4 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 | 1240-01-654-5246 |
| Primary Part Number | BEAST 5-25X56 F1 |
| Item Name | Sight,bore,optical |
| FSC / FSG | 1240 / 12 — Optical Sighting and Ranging Equipment |
| Manufacturer | Lightforce Usa, Incorporated Div Mil-Gov-Le |
| Status | ACTIVE |
| Magnification Type | VARIABLE |
| Optical Device Type | LENS |
| Focusing Type | ADJUSTABLE |
| Straight Type Overall Length | 56.0 MILLIMETERS NOMINAL MM |
| 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 |
|---|---|
| BEAST 5-25X56 F1 | Lightforce Australia Pty Ltd (AUS) |
| M539 | Lightforce Usa, Incorporated Div Mil-Gov-Le (USA) |
| M539 | Lightforce Australia Pty Ltd (AUS) |
| BEAST 5-25X56 F1 PRIMARY | Lightforce Usa, Incorporated Div Mil-Gov-Le (USA) |
NSN 1240-01-654-5246 is a Sight,bore,optical, manufactured by Lightforce Usa, Incorporated Div Mil-Gov-Le, classified under FSC 1240, Optical Sighting and Ranging Equipment. Status: active.
NSN 1240-01-654-5246 has 4 manufacturer part numbers on file: BEAST 5-25X56 F1 (Lightforce Australia Pty Ltd), M539 (Lightforce Usa, Incorporated Div Mil-Gov-Le), M539 (Lightforce Australia Pty Ltd), BEAST 5-25X56 F1 (Lightforce Usa, Incorporated Div Mil-Gov-Le).
1 possible match (shared part number, not a government interchangeability claim): 5331-01-688-6848. Verify interchangeability with system specifications before substitution.
Key specifications for BEAST 5-25X56 F1: Magnification Type: VARIABLE; Optical Device Type: LENS; Focusing Type: ADJUSTABLE; Part Name Assigned by Controlling Agency: M539 BEAST RIFLESCOPE. 4 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 1240-01-654-5246 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.