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P-51 (original with 20mm) production block - WW2Aircraft.net
Info: RAF Guns of WW II - Axis History Forum
Hispano 20mm Cannon - Mk. I with belt feed mechanism
Hispano-Suiza HS.404 - Wikipedia
Cartridge case terminology and identification – Stephen Taylor, …
Hispano Mk. II./V & US M1, AN-M2/3 20mm Ammuniton
The Pacific War Online Encyclopedia: Hispano-Suiza 20mm Cannon
Alternative airborne guns 2.0 | Aircraft of World War II
Lancaster Turret | Aircraft of World War II - WW2Aircraft.net Forums
Breechblock - Wikipedia