Heckler & Koch HK433 - Wikipedia

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Assault rifle

Heckler & Koch HK433
A silhouette of HK433
Type	Assault rifleCarbine
Place of origin	Germany
Service history
In service	2024–present
Wars	Russo-Ukrainian war
Production history
Designer	Heckler & Koch
Designed	2017
Specifications
Mass	3.25 kg (7.2 lb) (11")3.40 kg (7.5 lb) (14.5")3.50 kg (7.7 lb) (16.5")
Length	577–843 mm (22.7–33.2 in) (11")634–931 mm (25.0–36.7 in) (14.5")703–971 mm (27.7–38.2 in) (16.5")
Barrel length	280 mm (11 in)368 mm (14.5 in)419 mm (16.5 in)
Width	81 mm (3.2 in)
Height	195 mm (7.7 in)
Cartridge	HK433: 5.56×45mm NATOHK437: .300 AAC Blackoutmore planned[1]
Action	Gas-operated short-stroke piston, rotating bolt
Rate of fire	850 rounds/min
Muzzle velocity	800 m/s (2,600 ft/s) (11" barrel)850 m/s (2,800 ft/s) (14.5" barrel)875 m/s (2,870 ft/s) (16.5" barrel)
Effective firing range	500 m (550 yd)
Feed system	30-round detachable STANAG magazine
Sights	Iron sights and Picatinny rails for various optics

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.[2]

History

[edit]

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.[3][4]

Heckler & Koch offered the HK433 along with the HK416 as a candidate for the German Bundeswehr's competition to select a new assault rifle.[5]

The HK G36, the Bundeswehr's standard assault rifle since 1997, is to be phased out and a replacement is planned to be phased in from 2020.

Design

[edit]

The HK433 was designed by Heckler & Koch to be familiar to operators with experience using the Heckler & Koch G36 and HK416 platforms. All controls are ambidextrous, and major components are modular, allowing for rifles to be configured in the field as needed.[6]

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.[7][8]

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 266 to 297 mm (10.5 to 11.7 in). 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.[9]

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 160 g (5.6 oz).

Variants

[edit]

Heckler & Koch HK437

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The Heckler & Koch HK437, chambered in .300 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 with several new caliber variants.[10][11]

Variant	Calibre	Status	Equal parts (to HK433)
HK433	5.56×45mm	Released	100% (Base)
HK437	.300 Blackout		80%
HK231	7.62×51mm	In development (2024-01)	65%
HK231	6.5 Creedmoor	Announced	?
HK132E	7.62×39mm	In development	?
HK132?	5.45×39mm	Announced	?
HK254	9×19mm	In development (2024-01)	35%
HK???	7.62x54mm R	Announced	?

Users

[edit]

• Germany:
  • 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.[12] 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.[13]
• Ukraine: Main Directorate of Intelligence[14]

References

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1. ^ "Heckler & Koch Eyes Adapting Its Rifles To Fire Soviet-Designed Ammo". TWZ. May 15, 2024. Retrieved May 15, 2024.
2. ^ "Heckler & Koch (HK) HK433 'Compact and Modular' 5.56mm NATO Assault Rifle/Carbine/SBR: What's the point?". Defense Review. August 10, 2017. Retrieved March 12, 2018.
3. ^ "Breaking News from Heckler & Koch – HK433 A New Rifle!". TFB. February 3, 2017. Retrieved March 12, 2018.
4. ^ "HK433 – The first practical test". TFB. August 18, 2017. Retrieved March 12, 2018.
5. ^ "Heckler & Koch bids to replace its own tarnished weapon - Germany - DW.COM - 03.02.2017". Deutsche Welle. February 3, 2017. Retrieved 2017-02-13.
6. ^ "Heckler & Koch: Product Overview - HK433". www.heckler-koch.com. Archived from the original on 2017-03-05. Retrieved 2017-03-05.
7. ^ "Heckler & Koch unveils HK433 modular assault rifle - IHS Jane's 360". www.janes.com. Retrieved 2017-02-13.
8. ^ "Heckler & Koch unveils new modular rifle – HK433". quwa.org. 6 February 2017. Retrieved 2017-02-13.
9. ^ "HK433 Modular Assault Rifle". Modern Firearms. 2017-07-13. Retrieved 2020-05-25.
10. ^ "Interview mit Marc Roth" (PDF) (in German). ESuT. 2023-12-01.
11. ^ "Handbook - STURMGEWEHR HK437" (PDF) (in German). Heckler & Koch. 2024-01-01.
12. ^ "HK437 – Polizei von Schleswig Holstein beschafft neue Mitteldistanzwaffen im Kaliber .300 BLK". soldat-und-technik.de (in German). 2022-10-27. Retrieved 2023-10-11.
13. ^ "Polizei Schleswig-Holstein stellt neue Mitteldistanzwaffe HK437 vor". soldat-und-technik.de (in German). 2024-02-15. Retrieved 2024-02-15.
14. ^ "Rare Sightings of Heckler & Koch G36 & HK433s in Ukraine". The Armourers Bench. 29 September 2024. Retrieved 29 September 2024.

External links

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• Heckler & Koch: Product Overview - HK433
• H&K HK433 at SHOT Show 2017
• Heckler & Koch HK433 modular assault rifle

v t e Heckler & Koch
Pistols	HK4 VP70 P9 P7 MK23 USP P2000 P30 HK45 VP9
Service rifles	G3 HK33 G41 G36 HK416 HK417 HK433 M27 IAR
Sniper rifles	HK G3 SG1 G28 HK 33 SG1 PSG1 MSG90 SL9SD M110A1
Civilian rifles	HK41 HK43 MR223 MR308 SL6 SL7 SL8 SR9 USC
Shotguns	HK 512 FABARM FP6
Submachine guns	MP5 MP5K MP7 MP2000 UMP
Machine guns	HK21 MG4 MG5
Grenade launchers	HK69A1 AG-C/EGLM AG36 M320 GMG XM25 CDTE
Prototypes	Handguns P46 Rifles HK32 HK36 G11 XM29 OICW XM8 Shotguns HK CAWS
Miscellaneous	P2A1 P11 4.6×30mm 4.6×36mm L98A2

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