In its debut test, the weapon fired 20,000 rounds with only a few malfunctions mostly related to poorly loaded cloth belts. The reliability was exceptional, so Browning fired another 20,000 rounds through the weapon with one broken part a broken sear at about 39,500. The Ordnance Board was impressed, but was unconvinced that the same level of performance could be achieved in a production model. Consequently, Browning used a second gun that not only duplicated the original trial, but it also fired continuously for 48 minutes and 12 seconds.
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