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Heckler & Koch HK433

Modular Assault Rifle / Carbine (2017)

Infantry Small Arms / The Warfighter

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Image from official Heckler and Koch marketing materials.

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Officially introduced in 2017, the German Heckler and Koch HK433 is presented as a fully-modular assault rifle system

Authored By: Staff Writer | Last Edited: 06/14/2021 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.
In 2017, long-time German gun-maker delivered to market its latest vision - a fully-modular, compact, and lightweight assault carbine for the next generation of warfighter. The product relies on the proven 5.56x45mm NATO intermediate rifle cartridge firing from a 30-round curved magazine. The rifle/carbine was unveiled during EnforceTac 2017 and maintains an active marketing presence in the Heckler & Koch firearms lineup.

The gun's basic design is conventional by modern standards and includes all of those qualities proven in many earlier designs. There is full ambidextrous support, an inherent "quick-change" barrel capability, and tool-less left-/right side charging handle design. The weapon can be cocked in all of its safety positions and a round-counter is built into the receiver. The buttstock is foldable and of the retractable sort and comes complete with an adjustable checkpiece for precision shooting at range. The gun can be fired with its buttstock collapsed/folded.

The upper receiver sports a STANAG 4694 profile with a long-running section of Picatinny rail for the mounting of accessories. The slim handguard also has mounting points at the 3- and 9-o'clock positions for additional tactical hardware. Supported components include bipods, drum magazines, and bayonet. The barrel can be capped with a suppressor for clandestine work.

The entire weapon can be disassembled into its primary compoents without any tools in-the-field.

The trigger group sits ahead of the angled hand grip in the usual way and features an oversized loop for a gloved hand. The trigger assembly if of the typical curved design. The magazine well is seated ahead of the trigger group and accepts the 30-round STANAG-type magazine. The internal action involves a short-stroke piston system with rotating bolt-action. Rate-of-fire reaches 700 rounds-per-minute while effective firing ranges are out to 660 yards. Longer barrels achieve longer ranges. Muzzle velocity is rated at 3,030 feet-per-second with higher rates achieved with long barrel assemblies.

The shortest compact model in the series measures 22.7 inches collapsed and 33.2 inches extended. The longest is 31.2 inches long collapsed and 41.7 inches extended.

HK markets its HK433 to current or past operators of its popular G36 assault rifle series and as a suitable replacement for the newer HK416 line.


Service Year

Germany national flag graphic


Modular Assault Rifle / Carbine

Heckler & Koch GmbH - Germany
National flag of modern Germany National flag of the United States Germany; United States
(OPERATORS list includes past, present, and future operators when applicable)
Automatic Function
Features a mechanical function to automate the firing action.
Assault Rifle
Modern class of long gun featuring select-fire properties, automatic internal function, and magazine feeding.
Special Forces
Qualities of this weapon have shown its value to Special Forces elements requiring a versatile, reliable solution for the rigors of special assignments.

Overall Length
845 mm
33.27 in
Barrel Length
280 mm
11.02 in
Empty Wgt
7.17 lb
3.25 kg

Iron Front and Rear; Optional Optics.


Short-Stroke Piston; Rotating Bolt System

Short-Stroke Piston
Type of gas operation typically found in rifle-type arms; relatively short amount of piston movement with reliance on sudden blow for quick acceleration of said piston; lever connected to the bolt is actuated, taking on the resultant energy, subsequently passing it on to the awaiting bolt.
Rotating Bolt
System utilizes internal mechanism to lock the breech or rear barrel assembly prior to firing.
(Material presented above is for historical and entertainment value and should not be construed as usable for hardware restoration, maintenance, or general operation - always consult official manufacturer sources for such information)


5.56x45mm NATO

Sample Visuals**

Graphical image of a 5.56mm intermediate rifle cartridge
Rounds / Feed

30-round detachable box magazine (STANAG type)
Cartridge relative size chart
*May not represent an exhuastive list; calibers are model-specific dependent, always consult official manufacturer sources.
**Graphics not to actual size; not all cartridges may be represented visually; graphics intended for general reference only.
Max Eff.Range
170 ft
(52 m | 57 yd)
Muzzle Velocity
3,030 ft/sec
(924 m/sec)

HK433 - Base Series Designation.

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