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 5.56mm NATO cartridge. The rifle/carbine was unveiled during EnforceTac 2017 and maintains an active marketing presence in the Heckler & Koch firearms lineup. The series follows the proven AR15-style HK416 and HK417 marks (detailed elsewhere on this site) into the global marketplace and is influenced by HK's direction with its HK G36 adopted by the German Army.
Being both modular and compact gives the operator essential qualities when engaging foes in urban environments. The base design is chambered for the NATO-standard 5.56x45mm intermediate rifle cartridge feeding from a 30-round, curved, spring-loaded magazine. The general arrangement of the rifle is conventional with a folding / retractable shoulder stock (including a height-adjustable cheek rest), integrated pistol grip / trigger unit, forward magazine well, perforated cooling hand guard, and extended barrel. The entire length of the top of the frame and forend sport a long line of Picatinny rail for the mounting of accessories. Additional mounting points are found under the hand guard and the sides (3- and 9-o'clock) are managed through the "HKey" interface. Iron sights can be retained as backup while various optics, aimers, and lights can be affixed to the gun.
A unique feature to the HK433 is a cartridge "counter" showing available rounds in the magazine.
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 components without any tools in-the-field.
Controls are ambidextrous along the side of the frame near the trigger unit and the trigger loop is oversized to accept a gloved hand. The charging handle is non-reciprocating and the weapon can be arranged to suit both left- and right-handed shooters without any tools. Furthermore, the weapon can be charged even with the safety on - making the rifle ready-to-fire at a moment's notice. The internal action is of proven gas-operation supporting single- or full-automatic fire modes.
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.
As per HK marketing materials, the base rifle offered has a manageable operating weight of 3.25kg and a rate-of-fire near 700 feet-per-minute. Maximum length reaches 843mm with a collapsed length of 577mm. The barrel measures 280mm in length. These values naturally differ between sub-variants of the line. 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.
June 2022 - The rifle was showcased at Eurosatory 2022.
(OPERATORS list includes past, present, and future operators when applicable)
Features a mechanical function to automate the firing action.
Modern class of long gun featuring select-fire properties, automatic internal function, and magazine feeding.
Qualities of this weapon have shown its value to Special Forces elements requiring a versatile, reliable solution for the rigors of special assignments.
845 mm 33.27 in
280 mm 11.02 in
7.17 lb 3.25 kg
Over-Receiver Optics; Optional Backup Iron.
Short-Stroke Piston; Rotating Bolt System.
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.
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)
Rounds / Feed
30-round detachable box magazine (STANAG type)
*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.
170 ft (52 m | 57 yd)
3,030 ft/sec (924 m/sec)
HK433 - Base Series Designation.
Ribbon graphics not necessarily indicative of actual historical campaign ribbons. Ribbons are clickable to their respective campaigns / operations.
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Image from official Heckler and Koch marketing materials.
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