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

The U.S. Marine Corps is aiming to put in an order for new anti-drone 5.56x45mm ammunition for its M4 carbines and M27 rifles by the end of the year. Produced by a company called Drone Round, the L Variant cartridge has a projectile that breaks into multiple segments to improve the probability of scoring a hit on a small, fast-moving aerial target. The idea is to give anyone with a rifle an immediate boost in their ability to defend against growing drone threats, especially first-person view (FPV) kamikaze types now proliferating around the globe after becoming a fixture in the war in Ukraine.

Marine Corps Systems Command (MARCORSYSCOM) announced its intention to buy an unspecified number of 5.56x45mm L Variant cartridges through a sole-source contract with Drone Round in a notice posted online yesterday. The projected date of the contract award is December 2026.

“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.

Porting these concepts of multi-projectile small arms cartridges over to counter-drone is a growing trend at this point, too. In February, the Naval Surface Warfare Center, Crane Division (NSWC Crane) unveiled multiple Drone Killer Cartridge (DKC) designs it had internally developed in 5.56x45mm, 7.62x51mm, and .50 caliber flavors.

“During a recent demonstration at Camp Atterbury in Edinburgh, Indiana, DKC achieved a 92% success rate against drone targets,” according to a Navy press release. What further progress has been made since then in the development of any of the DKC designs, or their fielding, is unknown.

Various multi-projectile small arms cartridges intended specifically for engaging small drones have already emerged in recent years on both sides of the conflict in Ukraine. This includes locally fabricated designs, some of which use 3D-printed sabots loaded with commercially available metal BBs, and mass-production types made by established companies like the Kalashnikov Group in Russia.

To reiterate, the key benefit that multi-projectile counter-drone cartridges offer is the boost in hit probability when engaging small and highly maneuverable drones. They can also be fired from existing guns without modification. This, in turn, presents a way to give anyone in a unit with an M4 or M27 an additional means of protecting against uncrewed aerial threats without adding to the bulk and weight that personnel already have to carry around.

The Marine Corps and other branches of the U.S. military have already been pursuing other add-on capabilities to improve the effectiveness of small arms against small drones, especially for individual rifles. In particular, variants of the SMASH family of computerized optical sight systems from Israeli firm Smart Shooter have been in growing use across America’s armed forces, and elsewhere globally, for years now. The Marines have at least tested another counter-drone rifle aiming system that uses a buttstock designed to automatically move the gun in line with the target. These are capabilities that could easily be paired with specialized ammunition. It might be possible to tweak software behind these systems to better work with multi-projectile loadings, too.

At the same time, questions have been raised about the efficacy and utility of responding to drone attacks with rifles and other individual small arms like shotguns. Since they already fire multi-projectile rounds, shotguns have already emerged as another counter-drone tool, and are notably in regular use in this role on battlefields in Ukraine, regardless.

Range has been cited as one limiting factor, especially for shotguns. Specialized rifle rounds like Drone Round’s L Variant and the DKC types developed by NSWC Crane, which are fired at higher velocities than shotgun shells, are intended to help mitigate this, at least to a degree. However, as noted, Drone Round says that the effective range that it has demonstrated with its 5.56x45mm types to date is 328 feet (100 meters). As a point of comparison, the stated effective range of an M4 carbine firing standard single-projectile ammunition is around 1,640 feet (500 meters), according to the Army.

The closer a counter-drone engagement occurs, the less time there is to react, overall. There is the additional question then of whether standing and fighting is the best course of action.

“When shooting you are static, which makes it easier for the operator to aim the drone,” a contemporary Russian manual on counter-drone tactics notes, according to a report in April from Forbes. That being said, there might not be somewhere safer to move in many cases.

Having to manage multiple ammunition types on the fly could also present challenges. What kind of effectiveness rounds like L Variant might offer against more traditional targets is unclear.

All this being said, counter-drone rifle rounds do continue to be fielded on both sides of the conflict in Ukraine, even if the full extent of their use is not entirely clear. The explicit fielding of shotguns as counter-drone weapons is another trend that is growing globally, including in the U.S. military.

Small arms are, of course, just one part of a layered ecosystem of defenses necessary to challenge the ever-growing threats posed by various tiers of drones. For the Marine Corps, specialized counter-drone 5.56x45mm ammunition is now in line to be part of that larger equation.

Contact the author: joe@twz.com

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