Profile
- Origin
- United States
- Built by
- Delfasco, LLC
- Type
- Practice bomb
Munitions
MK-76 practice bomb
Also known as
- MK76
- MK-76
- MK76-5
- MK-76 Mod 5
- MK76-5 Twin Pack Practice Bomb
- MK76 practice bomb
- MK76 Twin Pack
- Mk 76
- Mark 76
The MK-76 practice bomb is a U.S. 25-pound naval training munition used for air-to-ground release practice, impact marking, and pilot certification rather than combat effects. Delfasco identifies MK76 practice bombs as U.S. Navy 25-pound practice-bomb products, Marvin describes the Navy Mk-76 designation in the SUU-20 practice-store context, and Navy/Marine reporting documents MK-76 drops from T-45C, F/A-18C, and AV-8B training aircraft.
Profile / Specs
Specifications
- Class
- 25-pound inert practice bomb
- Training effect
- Smoke cartridge marks the impact point during range work
- Documented variant
- MK-76 Mod 5 / MK76-5
- NSN
- 1325-01-071-2561 and 1325-01-071-2560 appear in MK76 Twin Pack / MK76-5 procurement listings
- Modern length and weight
- Approximately 24.64 inches long and 24.5 lb for MK76-5 sources-sought description
- Bomb-body material
- Gray iron casting in accordance with ASTM A48 Class 20, as described in ASBCA contract-record discussion
- Procurement pairing
- Often procured with BDU-33 D/B practice bombs and 25-pound bomb suspension lugs
- Training dispenser
- SUU-20/A carries six practice stores and ejects practice bombs with a gas-driven piston ram
- Documented aircraft
- T-45C Goshawk, F/A-18C Hornet, and AV-8B Harrier training contexts are documented in U.S. Navy and DVIDS sources
Variants
Open sources use MK-76, Mk-76, MK76-5, and MK-76 Mod 5 wording for the U.S. Navy 25-pound practice-bomb line. Older ordnance references describe Mod 0 through Mod 2 construction and fuze differences, while modern procurement records focus on the Mod 5 / MK76-5 twin-pack item.
| Variant | Configuration | Designation notes |
|---|---|---|
| Mk 76 Mod 0 | Early impact-fired 25-pound practice bomb | Bulletpicker describes the Mod 0 as a cast-metal, centrally bored practice bomb with a tail-tube assembly, fin assembly, firing-pin assembly, and single suspension lug. |
| Mk 76 Mod 1 | Air-burst practice-bomb configuration | Bulletpicker distinguishes the Mod 1 as an air-burst-only configuration using the AN-M146E3 time fuze and a Mk 4 Mod 3 signal seated in the body bore. |
| Mk 76 Mod 2 | Impact-fired configuration with indexing holes | Bulletpicker describes the Mod 2 as similar to the Mod 0 but with two indexing holes at the center of gravity for positioning in the Aero 8A practice bomb container. |
| MK-76 Mod 5 / MK76-5 | Modern procurement configuration | GAO, ASBCA, USAspending, and SAM.gov material use MK-76 Mod 5 or MK76-5 for recent 25-pound practice-bomb procurement alongside BDU-33 D/B bombs and suspension lugs. Sources: Delfasco LLC Bid Protest | GAO, Delfasco ASBCA Practice Munitions Appeal | ASBCA, Delfasco 2025 Delivery Order | USAspending, MK76 C/B and BDU-33 Small Practice Bomb | SAM.gov |
Training Dispensers
The MK-76 appears in open sources as a small practice store carried by training dispensers and tactical aircraft, not as a standalone combat munition.
| Carrier | Carrier type | Carriage evidence |
|---|---|---|
 | Practice-bomb dispenser and rocket launcher | Marvin describes the SUU-20/A as carrying six practice stores and states that the 25-pound BDU-33 practice bomb is designated Mk-76 by the U.S. Navy. Sources: SUU-20 | Marvin Engineering |
Carrier Aircraft
| Carrier | Carrier type | Carriage evidence |
|---|---|---|
 | Carrier-capable multirole fighter | DVIDS reporting and imagery document Marine ordnance crews loading MK-76 practice bombs on F/A-18C Hornets during unit-level training. Sources: Ordnance Marines Keep Hornets Armed | DVIDS, F/A-18C MK-76 loading image | DVIDS |
 | V/STOL attack aircraft | DVIDS imagery documents Marines loading an MK-76 practice bomb onto an AV-8B Harrier during air-to-surface deployment training. Sources: AV-8B MK-76 loading image | DVIDS |
Training Role And Handling
The MK-76 is a range-training store rather than an explosive combat bomb. DVIDS describes the 25-pound MK-76 as non-explosive with a smoke cartridge to mark impact, while Marvin's SUU-20 material explains that practice bombs are gas-ejected from the dispenser and then free-fall to the target.
Primary user context
Delfasco identifies MK76 practice bombs as U.S. Navy 25-pound practice-bomb products, and SAM.gov material distinguishes Navy MK76-5 demand from Air Force BDU-33 demand.
Training effect
Marine Corps reporting states that the MK-76 carries a smoke cartridge to mark the impact point, giving aircrews visual scoring feedback without a live-warhead effect.
Carrier context
Open imagery and reporting document MK-76 loading or drops with F/A-18C Hornets, AV-8B Harriers, and T-45C Goshawk jet trainers.
Sources: Delfasco Products | Delfasco; MK76 C/B and BDU-33 Small Practice Bomb | SAM.gov; Ordnance Marines Keep Hornets Armed | DVIDS; SUU-20 | Marvin Engineering; Training Wing Strike Pilot Detachment | U.S. Navy.
Timeline
MK-76 practice bomb Key Events
GAO naval aviation training-munitions report
GAO listed MK-76/BDU-48 practice bombs among Navy and Marine Corps tactical aviation training-ordnance categories and compared requested and received quantities across fiscal years 1998-2001.
Sources: Naval Aviation Training Munitions Report | GAO
Marine F/A-18C training load
DVIDS reported VMFA-122 ordnance crews loading MK-76 practice bombs onto F/A-18C Hornets at Eielson Air Force Base for Distant Frontier unit-level training.
Sources: Ordnance Marines Keep Hornets Armed | DVIDS
GAO procurement decision
GAO described an Army procurement covering MK-76 Mod 5 25-pound practice bombs, BDU-33 D/B practice bombs, and 25-pound suspension lugs, and identified Delfasco as a previous producer of MK-76 practice bombs.
Sources: Delfasco LLC Bid Protest | GAO
Delfasco IDIQ contract
ASBCA records state that a firm-fixed-price indefinite-delivery/indefinite-quantity contract awarded to Delfasco included MK-76 Mod No. 5 and BDU-33 D/B practice bombs.
Sources: Delfasco ASBCA Practice Munitions Appeal | ASBCA
T-45C strike detachment drops
A Navy story on a Training Air Wing 2 strike detachment said Navy and Marine Corps student naval aviators dropped their first MK-76 practice bombs from T-45C Goshawk jet trainers at El Centro.
Sources: Training Wing Strike Pilot Detachment | U.S. Navy
Production delivery order
USAspending lists a Department of Defense delivery order to Delfasco for production quantities of MK76-5 practice bombs, BDU-33 D/B practice bombs, and 25-pound bomb suspension lugs.
Sources: Delfasco 2025 Delivery Order | USAspending
Media
MK-76 practice bomb Videos
Related Weapon Systems
Sources
Delfasco Products | DelfascoPublisher: Delfasco, LLC | Note: Supports MK76 product-line context, Delfasco manufacturer attribution, MK76 Twin Pack NSN listings, Navy supplier context, and official product-image provenance. | Accessed: 2026-07-13Delfasco LLC Bid Protest | GAOPublisher: U.S. Government Accountability Office | Note: Supports MK-76 Mod 5 25-pound practice-bomb procurement context and Delfasco's previous production history for MK-76 practice bombs. | Accessed: 2026-07-13Delfasco ASBCA Practice Munitions Appeal | ASBCAPublisher: Armed Services Board of Contract Appeals | Note: Supports the Delfasco contract for MK-76 Mod No. 5 and BDU-33 D/B practice bombs and the gray-iron MK-76 bomb-body material detail. | Accessed: 2026-07-13Delfasco 2025 Delivery Order | USAspendingPublisher: USAspending.gov | Note: Supports the 2025 production delivery order for MK76-5 practice bombs, BDU-33 D/B practice bombs, and 25-pound bomb suspension lugs. | Accessed: 2026-07-13MK76 C/B and BDU-33 Small Practice Bomb | SAM.govPublisher: System for Award Management | Note: Supports recent MK76-5 sources-sought context, MK76-5 Twin Pack wording, NSN 1325-01-071-2560, approximate 24.64-inch length, 24.5-pound finished weight, Navy end-user context, and planned procurement with BDU-33 D/B bombs and 25-pound suspension lugs. | Accessed: 2026-07-13Naval Aviation Training Munitions Report | GAOPublisher: U.S. Government Accountability Office | Note: Supports MK-76/BDU-48 practice bombs as Navy and Marine Corps tactical aviation training ordnance in fiscal-year 1998-2001 readiness analysis. | Accessed: 2026-07-13SUU-20 | Marvin EngineeringPublisher: Marvin Engineering Co. | Note: Supports SUU-20/A practice-store carriage, six-practice-store capacity, gas-driven piston-ram bomb ejection, and the statement that the 25-pound BDU-33 practice bomb is designated Mk-76 by the U.S. Navy. | Accessed: 2026-07-13Ordnance Marines Keep Hornets Armed | DVIDSPublisher: Defense Visual Information Distribution Service | Note: Supports F/A-18C MK-76 loading during VMFA-122 Distant Frontier unit-level training and the 25-pound non-explosive smoke-cartridge description. | Accessed: 2026-07-13F/A-18C MK-76 loading image | DVIDSPublisher: Defense Visual Information Distribution Service | Note: Public-domain image source documenting a Marine ordnance technician loading an MK-76 practice bomb onto an F/A-18C Hornet during Distant Frontier training. | Accessed: 2026-07-13AV-8B MK-76 loading image | DVIDSPublisher: Defense Visual Information Distribution Service | Note: Public-domain image source documenting Marines loading an MK-76 practice bomb onto an AV-8B Harrier during air-to-surface deployment training. | Accessed: 2026-07-13USS Kitty Hawk MK-76 practice bombs image | DVIDSPublisher: Defense Visual Information Distribution Service | Note: Public-domain image source documenting blue MK-76 practice bombs on the USS Kitty Hawk flight deck during Indian Ocean operations in August 2006. | Accessed: 2026-07-13Training Wing Strike Pilot Detachment | U.S. NavyPublisher: U.S. Navy | Note: Supports Training Air Wing 2 use of MK-76 practice bombs from T-45C Goshawk jet trainers during Navy and Marine Corps student strike training at El Centro. | Accessed: 2026-07-13Mk 76 Mod 0-2 Practice Bomb | BulletpickerPublisher: Bulletpicker | Note: Specialist ordnance reference supporting historical Mk 76 Mod 0, Mod 1, and Mod 2 construction and functioning distinctions. | Accessed: 2026-07-13