Anti-Drone 5.56mm Rifle Rounds That Break Into Multiple Projectiles Sought By Marines

“The 5.56mm Drone Round ‘L Variant’ is the only kinetic munition currently available in the commercial or defense marketplace that meets the Marine Corps’ strict minimum capability requirements for immediate c-sUAS [counter-small uncrewed aerial systems] defense,” according to an accompanying document justifying the need for a sole-source deal. “Specifically, this round is the only solution offering ‘drop-in’ compatibility that requires no physical modifications, specialized upper receivers, or distinct weapon platforms to be operable in current-issue Marine Corps 5.56mm weapons (e.g., M27, M4, and M4A1).”

“Furthermore, its deployment requires zero additional New Equipment Training or specialized occupational specialties, rendering it immediately effective upon issue,” the justification adds. “Failure to deliver this capability places an unnecessary risk to Marines and could lead to mission failure and loss of life.”

Drone Round has been developing specialized anti-drone ammunition for small arms since at least 2025. At the time of writing, the company offers two 5.56x45mm versions, the aforementioned L Variant and a K Variant. The L and K versions have projectiles designed to split into five and eight segments, respectively.

With their different loadings, the L and K Variants are effective out to around 328 and 164 feet (100 and 50 Meters), both of which are relatively short ranges, according to Drone Round. No special modifications are required to use the ammunition in existing guns, and the company says the rounds are “full-auto and suppressor capable.”

L and K Variants in 7.62x51mm have also been developed, but are still in testing. Work is underway on 6.8x51mm versions, which could be fired from the U.S. Army’s new M7 rifles, M8 carbines, and M250 light machine guns. Other calibers could be on the horizon, as well.

Some Army units have at least evaluated the 5.56x45mm L Variant already. There are reports that Ukrainian forces have done so, as well.

Marine Corps interest in ammunition of this kind, broadly, is also not new. “Enhanced ammunition for existing firearms (buckshot-like 5.56, 7.62, .50, .40mm)” was among a list of desired squad and platoon-level counter-drone capabilities included in a separate contracting notice MARCORSYSCOM put out back in 2024. This reflected the then-recent rollout of a larger service-wide counter-drone vision, the core of which is ensuring that virtually every Marine can play a role.

“For our ammunition portfolio, we need industry’s help in counter-UAS munitions for our existing weapon systems,” Marine Col. Paul Gilikin, the Program Manager for Combat Support Systems at MARCORSYSCOM, said during a talk at the Navy League’s annual Sea-Air-Space conference in April.

The basic idea of multi-projectile small arms ammunition to help improve hit probability is decades old. The U.S. Army notably explored this concept extensively in the 1950s and 1960s, but did not ultimately field any of the rounds it developed. Armed forces elsewhere around the globe have pursued similar projects over the years.

Different types of pellet-filled rounds have also been developed for various small arms, including rifles and handguns, in the past, with the Glaser Safety Slug seen in the video below being one of the better-known examples. However, small arms cartridges of this kind have typically been designed primarily for very close-range self-defense, survival, or even pest-control use.