XM307 was a cancelled 25 mm airburst crew-served weapon program.
The XM307 Advanced Crew Served Weapon grew out of the Objective Crew Served Weapon effort to give small units a lighter, longer-range, airburst-capable replacement or supplement for heavy crew-served weapons. General Dynamics developed it around 25 mm programmable ammunition, but the program was eventually cancelled before fielding.
Airburst ammunition, computerized fire control, low recoil, and lightweight portability were the key ideas.
The design combined a 25x59 mm automatic grenade launcher, computerized sighting/fire-control concepts, belt feed, and an attenuated recoil system. Its intended value was precision airburst engagement of troops behind cover, light vehicles, watercraft, and low-flying helicopters at ranges beyond legacy grenade launchers. It also linked conceptually to the XM312 .50-caliber conversion.
Its relevance is program history and technology direction, not operational deployment.
The XM307 did not enter regular service, so the page should avoid implying fielded combat use. Its importance is developmental: it shows the U.S. Army's early-2000s interest in programmable munitions and precision crew-served fires. The cancellation also explains why legacy Mk 19 and M2 systems remained dominant.
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