The Piston,breech, cataloged under National Stock Number 1005-00-157-5251, is classified within Federal Supply Class 1005 (Guns, Through 30mm) of the Weapons group. The manufacturer of record is Bae Systems Global Combat Systems Limited. The record lists 6 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Item Name | Piston,breech |
| FSC / FSG | 1005 — Guns, Through 30mm (FSG 10) |
| Manufacturers | Bae Systems Global Combat Systems Limited (CAGE K3743); Bae Systems (operations) Limited (CAGE U9143) |
| Parameter | Value |
|---|---|
| NSN | 1005-00-157-5251 |
| Primary Part Number | 7R9640739 |
| Item Name | Piston,breech |
| FSC / FSG | 1005 / 10 — Guns, Through 30mm |
| Manufacturer | Bae Systems Global Combat Systems Limited |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL D — Destroy Item |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Part Number | Manufacturer |
|---|---|
| D5E12204-161 | Bae Systems Global Combat Systems Limited (GBR) |
| DDE27699-161 | Bae Systems Global Combat Systems Limited (GBR) |
| 7R9640739 PRIMARY | Bae Systems Global Combat Systems Limited (GBR) |
| 7R309 | Bae Systems (operations) Limited (GBR) |
| 7R309 PRIMARY | Bae Systems Global Combat Systems Limited (GBR) |
| 7R9647206 PRIMARY | Bae Systems Global Combat Systems Limited (GBR) |
| Reference | Meaning |
|---|---|
| 7R309 | 5/9 Secondary reference Bae Systems Plc |
| 7R309 | 5/9 Secondary reference British Aerospace (military Aircraft & Aerostructures) |
NSN 1005-00-157-5251 is a Piston,breech, manufactured by Bae Systems Global Combat Systems Limited, classified under FSC 1005, Guns, Through 30mm. Status: active.
NSN 1005-00-157-5251 has 6 manufacturer part numbers on file: D5E12204-161 (Bae Systems Global Combat Systems Limited), DDE27699-161 (Bae Systems Global Combat Systems Limited), 7R9640739 (Bae Systems Global Combat Systems Limited), 7R309 (Bae Systems (operations) Limited), 7R309 (Bae Systems Global Combat Systems Limited) and 1 more.
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 1005-00-157-5251 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.