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About 100 of the early P-51A ( called NA 91 by North American ) were fitted with four 20mm cannon, many of these were sold to the RAF. In general it seems the 20mm guns were not as reliable as the 50 cal, and also the aircraft could only carry a limited supply of 20mm shells which were each about 3 times the weight of 50 cal.

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Q: Why was the P-51 only armed with 50 Calibre machine guns why not cannons?
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