USMC Tests KAC LMG and Anti-Drone Ammunition

• Elements of 2nd Battalion, 7th Marines evaluated the belt-fed Knight’s Armament Company Light Assault Machine Gun alongside 3rd Ranger Battalion.
• The Marine Corps purchased 400,000 units of 5.56mm L Variant anti-drone ammunition in August 2026, with 1,000,000 additional rounds planned for FY2027.
• The anti-drone round splits into 5 separate fragments upon barrel exit, delivering effective counter-UAS engagements out to 100 meters without requiring rifle modifications.
• Wider reissuing of the Recon Weapons Kit installs an 11-inch HK416 A5 upper receiver group onto the M27, reducing overall length when equipped with standard-issue suppressors.
• Squad fire control is upgrading via the Envision Rail aiming laser, ICU GR rangefinder, and Squad Common Optic.

Belt-Fed Re-evaluation: The Knight’s Armament LMG

The Marine Corps is reassessing its reliance on magazine-fed automatic rifles for organic squad fire support. In 2011, the Service initiated the replacement of the belt-fed M249 squad automatic weapon with the M27 Infantry Automatic Rifle. The transition aimed for suppression through precision.

However, sustained suppressive fire during multi-axis platoon assaults remains a structural bottleneck. When a support-by-fire position shifts, maneuvering assault elements require high-volume automatic fire. Controlling four to twelve magazine-fed rifles on full-automatic mode introduces command-and-control friction compared to controlling two belt-fed machine guns.

To address this, a cadre from 2nd Battalion, 7th Marines conducted preliminary firing assessments with the Knight’s Armament Company Light Assault Machine Gun (KAC LMG) alongside the 3rd Ranger Battalion. The KAC LMG utilizes a constant-recoil system, operating from an open bolt with disintegrating belt links. The platform weighs approximately 11 pounds, yielding a manageable automatic weapon for dismounted infantry.

Compact Receivers: The Recon Weapons Kit

Standard-issue M27 rifles feature a 16.5-inch barrel. When fitted with standard-issue suppressors, the overall weapon length creates clearance issues in modern combat vehicles and tight structures.

To mitigate this, the Marine Corps is expanding the issue of the Recon Weapons Kit (RWK). The kit replaces the default upper receiver with an 11-inch HK416 A5 upper receiver group.

Initially assigned to Marine reconnaissance units, the RWK is seeing broader fielding across line units. 2nd Battalion, 7th Marines and 3rd Battalion, 2nd Marines have received these short-barreled upper receivers. 26th and 36th Marine Expeditionary Units have also fielded the configuration within their battalion landing teams. The shorter barrel optimizes maneuverability without removing suppressor integration.

Counter-UAS Integration and Air Sentry Tactics

Uncrewed aerial threats have forced immediate tactical adaptations at the squad level. In August 2026, the Marine Corps purchased 400,000 rounds of the Drone Round 5.56 L Variant. The Service intends to acquire 1,000,000 additional cartridges in FY2027.

The L Variant cartridge contains a payload that splits into 5 separate sub-projectiles upon exiting the barrel. It functions effectively up to 100 meters. The round requires no modified barrel, specialized upper receiver, or dedicated optic. It operates safely through standard suppressors, magazines, and belt-fed mechanisms.

Tactically, units are testing the role of an air sentry within the lead fire team. Because the lead rifleman must remain focused on ground point-security, the air sentry responsibility falls to the fire team leader or the automatic rifleman position.

Issued magazines loaded with L Variant rounds allow riflemen to convert their M27 or M4 into a high-capacity counter-drone tool without adding heavy single-purpose hardware.

The Marine Corps is pragmatically re-balancing squad lethality and versatility. While the M27 simplified logisitics and individual marksmanship, its inability to match the continuous volume of fire produced by belt-fed light machine guns leaves a operational void in support-by-fire scenarios. Re-evaluating belt-fed weapons like the KAC LMG alongside compact 11-inch receivers shows a willingness to correct doctrine based on realistic combat feedback. Furthermore, dropping multi-projectile counter-drone ammunition straight into existing 5.56mm magazines provides a light, immediate defense against uncrewed aerial threats without overburdening the individual Marine.