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Technical Data Sheet
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5520544 — LEVER,BREECHBLOCK,COCKING

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

5520544: LEVER,BREECHBLOCK,COCKING.

The LEVER,BREECHBLOCK,COCKING is a the manufacturer industrial component. Key specifications include end_item_identification: MK40MOD0 BREECH MECHANISM. This part is cataloged in the U.S.

Government catalog under NSN 1015-01-304-6991, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
5520544
NSN: 1015-01-304-6991
FSC: 1015 — Guns, 75mm Through 125mm
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
end_item_identificationMK40MOD0 BREECH MECHANISM
NSN1015-01-304-6991
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available LEVER,BREECHBLOCK,COCKING TITLE COMPONENT PN 5520544 MFR LEVER,BREECHBLOCK,COCK
TECHNICAL CHARACTERISTICS
END ITEM IDENTIFICATIONMK40MOD0 BREECH MECHANISM
OTHER ITEMS IN FSC 1015 — Guns, 75mm Through 125mm
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
1015-00-007-2130 1015-00-010-3016 1015-00-012-4484 1015-00-014-2592 1015-00-014-2600 1015-00-014-2631 1015-00-014-7073 1015-00-014-7075
SUBSTITUTES & CROSS-REFERENCES 1
1015PL1880865Reference document
Same NSN cross-reference
Reference document — Informative reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandDemilitarization required — mutilation + specific procedure
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FREQUENTLY ASKED QUESTIONS
What is 5520544?
5520544 is a LEVER,BREECHBLOCK,COCKING.
What parts can replace 5520544?
There is 1 known substitute for 5520544: 1015PL1880865. Substitute compatibility should be verified for your specific system.
What is the NSN for 5520544?
5520544 is cataloged in the U.S. Government catalog under NSN 1015-01-304-6991. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.