Japanese soldier firing an assault rifle during small arms modernization training.
Analytics and Reports, Country Analytics, Military Analytics

Japan’s Military Transformation: Modernizing Small Arms

The defense posture of Japan is currently undergoing its most significant transformation since the conclusion of the Second World War. Faced with a security environment characterized as the most severe and complex in the post-war era, the Ministry of Defense (MOD) and the Japan Self-Defense Forces (JSDF) have embarked on a fundamental reinforcement of defense capabilities.1 This shift is marked by a departure from the traditional “Shield and Spear” doctrine—where Japan focused almost exclusively on defensive “shield” capabilities while relying on the United States for offensive “spear” functions—toward a more autonomous and integrated defense force capable of independent tactical response.3 Central to this evolution is a comprehensive modernization of small arms across all three military branches: the Ground Self-Defense Force (JGSDF), the Maritime Self-Defense Force (JMSDF), and the Air Self-Defense Force (JASDF). This modernization ensures that personnel are equipped with modern, modular, and reliable weaponry capable of operating in diverse environments, particularly the critical southwestern island chain that forms the primary front of Japan’s current defensive strategy.1

Executive Summary

The modernization of the JSDF small arms inventory is a multi-decade initiative designed to phase out Cold War-era equipment in favor of high-performance, modular platforms compatible with contemporary international standards and diverse operational theaters. The primary drivers of this change include the deteriorating security situation in the Indo-Pacific, the specific environmental requirements of amphibious operations in the Nansei Islands, and the collapse of key segments of Japan’s domestic defense manufacturing base, notably the withdrawal of Sumitomo Heavy Industries from machine gun production.1

The centerpiece of this modernization is the Howa Type 20 assault rifle, which is replacing the aging Type 89 and Type 64 rifles as the standard infantry arm. Accompanying the Type 20 is the Heckler & Koch (H&K) SFP9-M striker-fired pistol and the FN Minimi Mk3 light machine gun, both of which represent a move toward “maritimized” and ergonomically superior equipment.7 This report details the specific small arms utilized by each military branch, the technical advancements in ammunition such as the J3 High-Power 5.56mm cartridge, and the strategic implications of these procurement shifts for Japan’s “Southwest Shift” and its emerging role in regional security.8

Strategic Context and Geopolitical Drivers

The current overhaul of Japan’s small arms cannot be understood without the context of the “Southwest Shift.” This strategic reallocation of resources toward the Nansei (Ryukyu) Islands is a direct response to the perceived threat from the People’s Republic of China, specifically regarding amphibious incursions and maritime pressure in the East China Sea.3 The 2025 Defense of Japan report characterizes the current era as the most severe security environment in post-war history, citing the breakdown of the rules-based international order and aggressive efforts to assert sovereignty in the South and East China Seas.1

To address these challenges, the JSDF is emphasizing “Integrated Air and Missile Defense” (IAMD) and “Stand-off Defense Capabilities,” but it also recognizes that land defense and island recovery require modernized infantry equipment.1 The establishment of the JSDF Joint Operations Command (JJOC) in March 2025 further underscores the need for commonality in small arms across the branches to facilitate seamless joint operations.1

Demographic and Economic Constraints

Japan’s small arms procurement strategy is uniquely shaped by its domestic demographic crisis. A declining youth population has created a severe recruitment environment for the JSDF.2 Consequently, the new generation of small arms emphasizes ease of training, superior ergonomics, and reduced maintenance requirements. The goal is to maximize the lethality and efficiency of each individual soldier to compensate for smaller unit sizes. Furthermore, fiscal limitations and a weak economy have forced a more pragmatic approach to procurement, leading the MOD to abandon some domestic production in favor of more cost-effective direct imports from established global defense firms.3

Small Arms of the Japan Ground Self-Defense Force (JGSDF)

The JGSDF is the primary user of small arms within the JSDF, with an active personnel count of approximately 247,000 as of 2025.13 The branch’s mission has evolved from traditional large-scale mechanized land defense to rapid deployment and amphibious warfare.5

The Standard Service Rifle: Howa Type 20

The Howa Type 20 was officially unveiled in 2020 as the successor to the Type 89 5.56mm rifle.9 Developed by Howa Machinery, the Type 20 was selected after rigorous testing against foreign competitors, including the H&K HK416 and the FN SCAR-L.5 The primary requirement for the new rifle was “environmental durability,” specifically the ability to function reliably in the salty, humid, and sandy conditions of Japan’s southwestern islands.5

The Type 20 features a 13-inch (330mm) barrel, making it more compact than the 420mm barrel of the Type 89.9 It utilizes a short-stroke gas-piston system and a rotating bolt, a configuration that keeps the action cleaner and more reliable during high-volume fire.9 Unlike its predecessor, the Type 20 is fully modular, featuring a continuous Picatinny rail on the upper receiver and M-LOK attachment points on the handguard for optics, lasers, and foregrips.9

SpecificationHowa Type 20 Detail
Caliber5.56×45mm NATO 9
ActionGas-operated, short-stroke piston 9
Barrel Length330 mm (13 in) 9
Overall Length780 mm (collapsed) to 850 mm (extended) 9
Weight3.5 kg (7.7 lb) 9
Rate of Fire650–850 rounds/min 9
Effective Range500 m 9
Feed System30-round STANAG magazine 9

The tactical implication of the Type 20’s shorter barrel is a potential loss in muzzle velocity, which the MOD addressed through the simultaneous development of the J3 High-Power ammunition.8 The rifle also includes an ambidextrous safety selector and an adjustable stock with a cheek rest, accommodating the varying physical statures of modern recruits and the use of the new Type 18 Armoured Vest System.7

Sidearms: H&K SFP9-M

In 2020, the JSDF adopted the H&K SFP9-M as its new standard handgun, replacing the Minebea P9 (a license-produced SIG Sauer P220).7 The “M” designation identifies the maritime-optimized variant, which features corrosion-resistant internal components and a striker-fired action that provides a consistent trigger pull of approximately 22-23N.15

The SFP9-M offers a significant leap in firepower over the P9, moving from a 9-round single-stack magazine to a 15-round (or 17-round) double-stack magazine.15 Its ergonomic grip can be customized using 27 different combinations of interchangeable side panels and backstraps, a feature critical for ensuring a proper fit for all personnel.15

Machine Guns and Squad Support

The JGSDF machine gun inventory has faced a state of crisis in recent years due to the withdrawal of Sumitomo Heavy Industries from the market following a data falsification scandal.6 Sumitomo had previously manufactured the FN Minimi under license as the “5.56mm Machine Gun” (Mk1).19 To address the resulting shortfall and the technical inadequacies of the Mk1, the JGSDF began importing the FN Minimi Mk3 directly from Belgium in 2023.8

The Minimi Mk3 provides several ergonomic improvements, including an adjustable buttstock with a cheek rest and an integrated hydraulic buffer that reduces recoil and improves the weapon’s service life.20 The Mk3 is being procured in both 5.56mm and 7.62mm variants to serve as squad automatic weapons and general-purpose machine guns.20

ModelCaliberRoleStatus
FN Minimi Mk35.56×45mmSquad SupportNew Standard (Import) 8
Sumitomo Minimi5.56×45mmSquad SupportLegacy (Falsified data) 6
Type 62 GPMG7.62×51mmGeneral PurposeBeing Replaced 19
Type 74 GPMG7.62×51mmVehicle MountedIn Service 19
Sumitomo J2 (M2)12.7×99mmHeavy SupportStandard Issue 19

Precision and Sniper Systems

The JGSDF is also overhauling its precision fire capabilities. For decades, the primary sniper rifle was the Remington M24A2 SWS, a bolt-action system.7 However, modern doctrine emphasizes the use of semi-automatic Designated Marksman Rifles (DMRs) to provide rapid follow-up shots and better integration into squad-level maneuvers.

In 2023, the MOD selected the H&K G28E2 as the new anti-personnel sniper rifle.8 The G28E2 is a 7.62×51mm semi-automatic rifle capable of maintaining a accuracy of 1.5 MOA at 100 meters.23 It is equipped with a Schmidt & Bender 3–20×50 PM II telescopic sight and a top-mounted Aimpoint Micro T1 red-dot sight for close-quarters transition.23 The elite 1st Amphibious Rapid Deployment Regiment (ARDR) was the first unit to field these rifles, often utilizing them with Hensoldt NSV 1000 XR5 clip-on night vision systems for zero-shift nighttime combat.26

Submachine Guns and Specialized Backup

The Minebea PM-9 (9mm Machine Pistol) remains in service with certain specialized and non-frontline units.18 Based on the Mini-Uzi, the PM-9 features a distinctive foregrip to control its high cyclic rate of 1100 RPM.18 In addition to its high rate of fire, it has been criticized for poor accuracy due to its lack of a shoulder stock.18 The JGSDF has largely stopped procurement of the PM-9, looking toward the H&K MP5 as a potential replacement for special forces units.27

Small Arms of the Japan Maritime Self-Defense Force (JMSDF)

The JMSDF focuses on maritime security, anti-submarine warfare, and the protection of Japan’s vast Exclusive Economic Zone (EEZ). While small arms are not the primary weapon of a navy, they are critical for shipboard security, counter-piracy operations, and the specialized missions of the Special Boarding Unit (SBU).

Special Boarding Unit (SBU)

The SBU is the JMSDF’s elite special operations unit, established in 2001 in response to the Noto Peninsula incident involving a North Korean spy vessel.28 Because of their specialized mission set—which involves boarding hostile vessels in confined spaces—the SBU uses a wider and more sophisticated array of small arms than the standard JSDF infantry.28

The SBU’s primary assault rifle is the H&K HK416, which they use alongside the Howa Type 89 for certain missions.28 For close-quarters battle (CQB), they rely on the H&K MP5A5 and the modern SIG Sauer MPX submachine gun.28 Their sidearm of choice is the SIG Sauer P226R, known for its exceptional reliability in maritime environments.28

SBU Small ArmsCategoryCaliber
H&K HK416Assault Rifle5.56×45mm NATO 28
H&K MP5A5Submachine Gun9×19mm Parabellum 29
SIG Sauer MPXSubmachine Gun9×19mm Parabellum 28
SIG Sauer P226RSemi-Auto Pistol9×19mm Parabellum 29
H&K MSG-90Sniper Rifle7.62×51mm NATO 28

The SBU also utilizes the H&K MSG-90 semi-automatic sniper rifle, which is a militarized version of the PSG-1 specifically designed for maritime security and counter-terrorism.28 These weapons are often supported by specialized boarding equipment, RHIBs, and SH-60J helicopters for insertion.28

General Shipboard Security

Regular JMSDF vessels carry a standard inventory of small arms for force protection and sentry duties. This includes the SIG Sauer P220 (Minebea P9), the Howa Type 89, and the Minebea PM-9.18 The PM-9 is often issued to sailors for base security and shipboard use due to its compact nature, allowing for easy carry in the tight corridors of warships and submarines.18 As of 2024, the JMSDF is also beginning to transition to the Howa Type 20 and H&K SFP9-M for its security detachments, albeit at a slower pace than the JGSDF.7

Small Arms of the Japan Air Self-Defense Force (JASDF)

The JASDF is primarily responsible for the defense of Japanese airspace and space-domain operations. Its small arms are concentrated within base defense units and security detachments responsible for protecting high-value assets like F-35A fighters and Patriot missile batteries.2

Base Defense Modernization

JASDF security guards have traditionally used the Howa Type 89 and the Minebea PM-9.27 The PM-9 is the primary submachine gun for JASDF air base guard units.18 However, as the branch prepares to rebrand as the Air and Space Self-Defense Force by 2026/2027, it is modernizing its ground combat capabilities to counter potential special operations raids against airfields.30

The JASDF has requested over 2,900 Howa Type 20 rifles in recent budget cycles to replace the Type 89 in base defense units, particularly those in the southwestern region such as Naha Air Base in Okinawa and Nyutabaru Air Base in Kyushu.7 These units also utilize the SIG Sauer P220 and are in the process of adopting the H&K SFP9-M as their standard sidearm.7

Specialized Support

For perimeter defense, the JASDF utilizes Sumitomo Minimi light machine guns and M2 Browning heavy machine guns mounted on security vehicles.19 The branch is also exploring the integration of unmanned ground systems to supplement manned security patrols, reflecting the broader JSDF trend toward “unmanned defense capabilities”.1

Ballistic Advancements: The J3 High-Power Cartridge

A critical component of the JSDF small arms modernization is the development of the J3 High-Power 5.56×45mm cartridge by Asahi-Seiki.8 This ammunition was created specifically to solve the “short barrel” problem of the Type 20 rifle.8

When 5.56mm NATO rounds are fired from a shorter 13-inch barrel (as opposed to the standard 20-inch or 14.5-inch barrels), the muzzle velocity drops significantly. For example, standard SS109 ammunition typically leaves a 20-inch barrel at approximate 948 m/s, but this velocity can drop below 800 m/s in shorter barrels, reducing the round’s ability to fragment and penetrate modern body armor.8

The J3 High-Power cartridge addresses this through a monolithic steel core design, which prevents the bullet from deforming upon impact and ensures deeper penetration even at lower velocities.8 The round is lead-free, utilizing steel and red brass, and uses a double-base powder to maximize pressure within the Type 20’s shorter gas system.8

FeatureStandard SS109 (Type 89)J3 High-Power (Type 20)
Core MaterialLead / SteelMonolithic Steel 8
Jacket MaterialCopperRed Brass 10
Powder TypeSingle-BaseDouble-Base 10
Primary GoalGeneral fragmentationArmor penetration from short barrels 8

Support Weapons and Anti-Armor Capabilities

In addition to individual small arms, the JSDF utilizes several man-portable support weapons designed to counter armored vehicles and fortified positions.

Recoilless Rifles and Rockets

The JGSDF has long relied on the Carl Gustaf 84mm recoilless rifle, produced under license by Howa as the “Howa 84RR” (M2 variant).7 Between 1978 and 1990, approximately 2,700 of these units were delivered.7 Recognizing the need for modern multi-role capability, the MOD began procuring the Carl Gustaf M4 in 2023, with an initial order of 300 units.7 The M4 is significantly lighter than the M2 and features an integrated fire control system for improved accuracy.

For short-range anti-tank defense, infantry units use the Panzerfaust 3, manufactured under license by Nissan/IHI Aerospace.7 The Panzerfaust 3 is a 110mm rocket launcher capable of defeating main battle tanks equipped with reactive armor.

Guided Missile Systems

Japan is a leader in indigenous anti-tank guided missile (ATGM) technology. These systems are critical for the “defense of surrounding sea areas” and island recovery missions.33

  • Type 01 LMAT: A man-portable, fire-and-forget 140mm ATGM developed by Kawasaki.7 It is designed for use against armored vehicles and can be fired by a single soldier from the shoulder.
  • Type 87 Chu-MAT: A laser-guided 110mm ATGM used for medium-range support.7
  • Type 79 Jyu-MAT: A heavy 153mm anti-landing craft and anti-tank missile system.7

The “Sumitomo Scandal” and Industrial Realignment

The modernization of the JSDF has been complicated by the collapse of its traditional small arms manufacturing base. For decades, Sumitomo Heavy Industries was the sole provider of machine guns to the JSDF. However, in 2021, the MOD issued a formal warning to the company following revelations of data falsification in the production of the Type 62 and Minimi machine guns.6

Furthermore, some component blueprints for a prototype machine gun were leaked to a Chinese company by a subcontractor, violating Japan’s trade control laws.6 These incidents, combined with the low profitability of limited domestic production runs, led Sumitomo to withdraw from the small arms market entirely in 2023.8 This has forced the MOD to adopt a new procurement model: importing core combat systems (like the Minimi Mk3 and G28E2) directly from Western allies while focusing domestic production on highly specialized items like the Type 20 rifle and J3 ammunition.8

Unit-Specific Loadouts and Tactical Implementation

The deployment of small arms within the JSDF is highly unit-specific, reflecting the different operational priorities of various formations.

The 1st Airborne Brigade

The 1st Airborne, Japan’s premier paratrooper unit, is often the first to receive new equipment.18 They are a primary user of the Minebea PM-9 and the new Type 20 rifle.18 Their loadout emphasizes light weight and compact size for airborne insertion.

The Amphibious Rapid Deployment Brigade (ARDB)

The ARDB, established in 2018, is modeled after the U.S. Marine Corps and is tasked with the recovery of invaded islands.4 They were the first to receive the Type 20 rifle and the Beretta GLX160 grenade launcher.5 Their snipers use the G28E2 with advanced Leupold and EOTech optics, often integrating Hensoldt night vision for littoral operations.26

Summary of Major Unit Small Arms Use

UnitPrimary RifleSecondary / Support
ARDBType 20 5Minimi Mk3, GLX160 8
SFGpHK416, HK417 7MP5, P226R 27
1st AirborneType 20 18PM-9, M24A2 7
SBU (JMSDF)HK416 28MPX, P226R 28
Base Security (JASDF)Type 89, Type 20 7PM-9, M2 18

Future Outlook and Strategic Implications

Looking toward the 2030s, the JSDF is poised to achieve a fully modernized small arms fleet. The procurement of the Type 20 and SFP9-M is scheduled to be completed for all frontline units by 2027.7 This hardware modernization is closely tied to the “SHIELD” initiative—Synchronized, Hybrid, Integrated and Enhanced Littoral Defense—which will increasingly rely on unmanned assets and autonomous systems to supplement human infantry.12

The establishment of the JJOC will likely lead to more standardized small arms training and logistics across the JGSDF, JMSDF, and JASDF.1 Furthermore, Japan’s evolving export policies may eventually see the Type 20 or J3 ammunition offered to regional partners like the Philippines or Indonesia, strengthening Japan’s role as a security provider in the Indo-Pacific.3

Conclusion

The modernization of small arms within the Japan Self-Defense Forces represents a clear and decisive break from the post-war “defensive only” equipment posture. By adopting high-performance, modular platforms like the Howa Type 20, the H&K SFP9-M, and the FN Minimi Mk3, the JSDF has created an arsenal specifically tailored for the challenges of the 21st-century Indo-Pacific. The technical innovations in J3 ammunition and the tactical shifts within elite units like the ARDB and SBU demonstrate a sophisticated understanding of contemporary warfare. Despite industrial challenges and demographic constraints, the JSDF is emerging as a more autonomous, lethal, and integrated force, capable of resolutely defending Japan’s territorial integrity in an increasingly complex global security landscape.

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