The Heckler & Koch HK433 is a modular assault rifle chambered for 5.56×45mm which combines features of the G36 and the HK416 families of assault rifles.[1][2]
This article's factual accuracy is disputed. (February 2019)
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.[3]
The Heckler & Koch HK437 chambered in .300 Blackout and features a 7- and 9- inch barrel was originally announced along with the HK433 in 2017. In late 2022, the Ministry of the Interior, Municipal Affairs, Housing and Sports of the State of Schleswig-Holstein recently commissioned Heckler & Koch Germany to manufacture and supply the HK437.
History
The HK433 was first introduced at EnforceTac 2017 which went on the 1st and 2 March in Nürnberg, Bavaria, Germany, after the HK433 was shown to a select number of people at the earlier SHOT Show in January.[4][5] Heckler & Koch offered the HK433 along with the HK416 as a candidate for the German Bundeswehr's competition to select a new assault rifle.[6] 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
Short-stroke gas piston
The HK433 has multiple barrel lengths ranging from 11-, 12.5-, 14.5-, 16.5-, 18.9- or 20-inch. All of the barrels are cold hammer forged, hard chrome lined with a 178mm (1 in 7inch) 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 and a paddle-style magazine release. Side-folding the buttstock shortens the HK433 by 266 to 297mm (10.5 to 11.7in). The monolithic upper receiver is made of aluminium alloy, and the lower receiver is made of polymer.[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 finally been replaced by the more commonly used M-LOK system.
A contract of over 200 HK437 along with accessories was procured in October 2022 for a total amount of €1.68 million.[10]
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. [11]
This article uses material from the Wikipedia article Heckler_&_Koch_HK433, and is written by contributors.
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