12.7 rounds. Except for the P-51-1-NA version (British Mustang Mk.IA), which was equiped with 4 20-mm cannons and of which just 150 were built (55 to USAAF, 93 to RAF, 2 retained by North American for engine trials) , all P-51 variants were armed with 0.5 in (12.7-mm) Browning M2 guns. The A-36 ground attack version was armed with 6 guns, 4 in the wings and two in the nose; the P-51A/B/C variants were armed with 4 wing-mounted guns; and the P-51D/H/K variants with 6 wing-mounted guns.
Mmm, although bear in mind that the 4x20mm and 2x13mm of a FW190 was an even mores impressive armament, and a single 30mm Minengeschoß from a Me109 would split a P51 in half. .50 cal was not a particularly heavy weapon for a warbird.
I know - but at the time when the 0.5 armament was introduced, it was an improvement over the usual 0.3s, or the 0.303s used by the British. It actually caused the USAF a lot of problems later on, when they retained their 6-gun armament for future requirements - such as the F-80, F-82, F-84, F-86 and F-94. If they had upgunned their types to cannons, such as the British did (later marks Spitfire, as well as the Spiteful, Typhoon, Tempest, Hornet and Fury/Sea Fury props, and the Vampire and Meteor jets) they might have had an even better kill score over Korea. As it was, the 0.5s turned out to be... not good enough against types such as the MiG-15, which could take quite an amount of damage...
...
Then again, barely a decade later the USAF wanted to be too futuristic, dropping all gun/cannon armament in favour of FFAR unguided rockets, and AIM-2/AIM-4/AIM-7 guided missiles, which turned out to be an equally bad decision over Vietnam, as retaining gun-calibre armament had over Korea...
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