Heckler & Koch HK433
The Heckler & Koch HK433 is a modular assault rifle originally chambered for 5.56×45mm which combines features of the G36 and the HK416 families of assault rifles.
Heckler & Koch HK433

Sgt. Mykaela Martin · Public domain
- Name
- Heckler & Koch HK433
- Field
- assault rifle
- Region
- Germany
VALÉORINE Encyclopedia
VALÉORINE documentary reading
Documentary summary
The Heckler & Koch HK433 is a modular assault rifle originally chambered for 5.56×45mm which combines features of the G36 and the HK416 families of assault rifles.
Admitted source layer · organised and presented by VALÉORINE
Note VALÉORINE
No house-authored Note is published until its assertions and sources pass the VALÉORINE evidence contract. The documentary article remains available in full while that enrichment is being consolidated.
Documentary enrichment in progress · no unsupported statement published
Reference Check
Propose documentary evidence for Heckler & Koch HK433. A contribution is never written directly as fact: identity, source, rights and evidence gates still decide.
Sign in to contribute
World of VALÉORINE
Documentary connections
Only confirmed graph relationships appear here. Images are shown only when their identity and reuse rights both pass the documentary gate.
Documentary evidence
Evidence Panel
not yet certified
- Identity
- resolved
- Independent source families
- 0
- Admitted assertions
- 0
- Open conflicts
- 0
Authority files
wikidata · Q28649246 · wikipedia · Heckler & Koch HK433
In this article
Key facts
Key facts
• Name — Heckler & Koch HK433 • Type — Assault rifle Carbine • Design Date — 2017 • Designer — Heckler & Koch • Service — 2024–present • Wars — Russo-Ukrainian war • Action — Gas-operated short-stroke piston, rotating bolt • Origin — Germany • Is Ranged — Yes • Length — (11") (14.5") (16.5") • Weight — (11") (14.5") (16.5") • Cartridge — 5.56×45mm NATO (HK433).300 AAC Blackout (HK437) • Rate — 850 rounds/min • Velocity — (11" barrel) (14.5" barrel) (16.5" barrel) • Feed — 30-round detachable STANAG magazine • Sights — Iron sights and Picatinny rails for various optics
History
History
The HK433 was formally introduced at EnforceTac 2017 on 1 and 2 March in Nürnberg, Bavaria, Germany, after having been shown to a select number of people at SHOT Show in January. Heckler & Koch offered the HK433 along with the HK416 as a candidate for the German Bundeswehr's competition (System Sturmgewehr Bundeswehr) to select a new assault rifle. The HK433 has been proposed as a potential successor to the L85 as the next standard service rifle for the British Army under Project GRAYBURN.
Design details
Design details
• Illustration — Short-stroke gas piston diagram The HK433 was designed by Heckler & Koch to be familiar to operators with experienced with the Heckler & Koch G36 and HK416. All controls are ambidextrous, and major components are modular, allowing for rifles to be configured in the field as needed. The HK433 has multiple barrel lengths including 11, 12.5, 14.5, 16.5, 18.9 and 20 inches. All of the barrels are cold hammer forged, hard chrome lined with a 178 mm (1-in-7 inch) right-hand twist, six-groove rifling. It features a short-stroke gas piston driven system similar to the Heckler & Koch G36 and HK416, with a gas block regulator adjustment located above the barrel. The non-reciprocating charging handle can be changed to operate from either side of the forestock of the rifle, but does not have a locking recess like the Heckler & Koch G3 family of weapons. All other primary controls are ambidextrous. It has an interchangeable barrel system and a folding adjustable buttstock with a three position cheek riser Side-folding the buttstock shortens the HK433 by. The monolithic upper receiver is made of aluminium alloy, and the lower receiver is made of polymer. It is offered with the option of 2 different lower receivers: one with an AR-15 style magazine release button, and one with a paddle magazine release reminiscent of the G36. The HK433 features a STANAG 4694 NATO Accessory Rail at 12 o'clock that is backwards-compatible with the STANAG 2324/MIL-STD-1913 Picatinny rail. At 6 o'clock it features the STANAG 2324/MIL-STD-1913 Picatinny rail. At the 3 and 9 o'clock positions the proprietary "HKey" accessory attachment system, which was used on early versions of the rifle, has been replaced by the more commonly used M-LOK system. The empty weight of a HK433 Draft STANAG 4179 compliant box magazine is approximately.
Heckler & Koch HK437
Heckler & Koch HK437
The Heckler & Koch HK437, chambered in.300 AAC Blackout and featuring 7 and 9 inch barrels, was announced along with the HK433. Currently are three configurations of the HK433 and two configurations of the HK437 available: • Variant — Calibre — Length max. mm — Length min. mm — Barrel mm — Weight g • HK433 11" — 5.56×45mm — 843 — 577 — 280 — 3250 • HK433 14.5" — 5.56×45mm — 931 — 634 — 368 — 3400 • HK433 16.5" — 5.56×45mm — 976 — 718 — 421 — 3500 • HK437 Sneaker 9" —.300 Blackout — 745 — 487 — 178 — 3040 • HK437 Sneaker 11" —.300 Blackout — 795 — 537 — 229 — 3140 While the HK437 was originally announced alongside the HK433 in 2017, there are official sources confirming information about Heckler & Koch expanding the HK433 platform in different caliber variants. • Variant — Calibre — Status • HK433 — 5.56×45mm — Released • HK437 —.300 Blackout • HK231 — 7.62×51mm — In development (2024-01) • HK231 — 6.5 Creedmoor — Announced • HK132E — 7.62×39mm — In development • HK132E — 5.45×39mm — Announced • HK254 — 9×19mm — In development (2024-01)
Users
Users
• Germany: Two contracts were signed for the German Armed Forces: • The Bundeswehr has ordered 988 HK437 rifles for the KSK, designated as the "G39". • A contract of over 200 HK437 along with accessories was procured in October 2022 for a total amount of €1.68 million for the Schleswig-Holstein Police. In 2024, the State police of Schleswig-Holstein announced the intention to replace all of their SIG Sauer MCX and Heckler & Koch MP5 models with up to 1,700 HK437 rifles by 2026. • Ukraine: Main Directorate of Intelligence.

A Green Beret with 7th Special Forces Group tested various weapons on a firing range during RESCUE-OPS II in Alicante, Spain on April 26, 2023. U.S. Special Operations Command conducts regular engagements with allies and partners to hone skills and demonstrate our commitment to the security and stability of the European theater.
Sgt. Mykaela Martin · This image was released by the United States Army with the ID 230426-A-UE246-0031 (next). This tag does not indicate the copyright status of the attached work. A normal copyright tag is still require
Places
Named by the record
Places
Only places the record itself states, plotted where the house gazetteer settles their coordinates. Nothing is inferred from a name or a nationality.
- Germany
Named but not plotted · 1
Heckler & Koch HK433 is associated with Germany.
Country
Primary material
Documents and archives
reference work
- “Heckler & Koch HK433”, English Wikipedia, consulted as further reading
Reputable secondary · Wikipedia
institutional register
- Wikidata, structured authority record Q28649246: Heckler & Koch HK433
Unverified · Wikimedia Foundation
Literature
Scholarly footprint
A count of publications is evidence of attention, not of standing, and is given here only as a measure.
References
Citations
References
Each reference names the institution holding it, so a reader may go to the document itself.
reference work
Partially resolvedinstitutional register
Wikidata, structured authority record Q28649246: Heckler & Koch HK433Wikimedia Foundation
Unverified
Connections
Knowledge graph
Connections
Each connection was recorded deliberately, with the basis for it kept on the internal record.
Broader subject
1- assault rifleTerminology
Established from a fact already recorded on a verified source.
The Encyclopedia exists whether or not anything is for sale. Corrections are recorded rather than overwritten, and every version of this record is kept. Published 14 August 2026.
Elsewhere in Militaria
6,095 published records in this field, each with its sources named.
- Heckler & Koch HK36Terminology
- Heckler & Koch HK41Terminology
- Heckler & Koch HK416Terminology
- Heckler & Koch HK417Terminology
- Heckler & Koch HK512Terminology
- Heckler & Koch HK69A1Terminology
- Heckler & Koch Mark 23Terminology
- Heckler & Koch MG5Terminology
Best supported in this field
For owners
Own an object connected with Heckler & Koch HK433?
A specialist will read what you send and tell you what the house can establish, what it cannot, and whether the object is suited to sale. There is no charge and no obligation. The object stays with you throughout; nothing is shipped to us unless it is arranged in writing beforehand.