Canon

M718 SAPHEI

From Halopedia, the Halo wiki

The M718 semi armor-piercing, high-explosive incendiary (SAPHEI) round is a kind of ammunition employed by the United Nations Space Command. It is a 20mm round capable of being fired from the AV-22 Sparrowhawk's mounted GAU-23/AW/Linkless Feed Autocannon alongside the PGU-42/B API.[1]

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