HK433: Heckler & Koch's Fourth Assault Rifle Family Sets New Standards
(Source: Heckler & Koch; issued March 01, 2017)
Countless ideas, decades of know-how and sophisticated solutions tested and proven under the most rigorous conditions worldwide are the foundation of Heckler & Koch's pioneering weapon technologies. Ever since this traditional German company based in the Suebian town of Oberndorf was established in 1949, its value-added share has been 100 percent. High-Tech Made in Germany!

In addition to the worldwide tried and proven rifle families G36, HK416 and HK417, the HK433 has now been added to the product portfolio of the company as the fourth scalable assault rifle family. This completely new development emphasizes once again Heckler & Koch's claim to build the world's best assault rifles.

By supplying France (HK416AIF), Germany (G36), USA (US Marine Corps M27/HK416), United Kingdom (SA80), Norway (HK416), Spain (G36) and Lithuania (G36) with standard assault rifle weaponry, Heckler & Koch has become a global weapon outfitter of many armies and armed forces of the NATO. Many special forces of the Western World – including the US Special Forces, the “Kommando Spezialräfte (KSK)” of the German Armed Forces, and special governmental forces (for example, GSG9) – rely on assault rifles from Oberndorf.

The HK433 is a modular assault rifle with a basic caliber of 5.56 x 45 mm, which combines the strengths and excellent characteristics of the G36 and HK416 assault rifles. Further calibers such as the 7.62 mm NATO (HK231), .300 Blackoout and 7.62 mm x 39 Kalashnikov (HK123) are included in the concept and thus form the basis of a weapons family.

The HK433 was developed to meet the ever more complex challenges of asymmetric conflicts within the broad operational spectrum of infantry and specialized armed forces. The HK433 gives these forces full operability and operational safety. This is true under all climatic conditions and combat situations and combat intensities with intuitive handling, combined with maximum modularity, precision and weapon safety.

The HK433 is an indirect impingement short-stroke gas piston system with a locked form-optimized rotating bolt. The upper receiver made of high-strength aluminum has a continuous precise NATO-STANAG 4694 sight rail. At maximum length and low sight height, any commercially available sight units and night vision sights can be mounted. In addition to that, the receiver has a built-in maintenance-free round counter. The weapons data can be trans-mitted and archived wireless. The integrated G36 bolt guide of the upper receiver guarantees a constantly high functional safety and reliability of the weapon. The bolt design is based on that of the G36, except that it is equipped with a firing pin safety and self-lubricating sliding elements.

The lateral closely fitting, stationary charging handle can be converted without tools and can thus be operated from both sides. Moreover, it has an integrated forward assistance to chamber a cartridge silently. Whilst firing, the charging handle remains in its position. On the one hand, this increases the safety of the shooter in stressful situations and, on the other, it provides him with unrestricted holding and firing options. The ergonomically optimum positioning of the charging handle allows you to keep the weapon in the target while cocking the weapon.

The HK433 gives the shooter six different barrel length options, allowing him to adjust the weapon to the particular operational need. To this end, Heckler & Koch is offering barrel lengths of 11", 12.5", 14.5", 16.5", 18.9" and 20". All barrels can be replaced at the operators or maintenance level.

The barrels are cold forged, tempered and hard-chrome plated on the inside. The service life of the Heckler & Koch weapon barrels, which is already setting new standards, has once again been clearly increased through further optimization measures. As standard, the barrels are equipped with a further-developed and toolless adjustable gas port for sound suppressor operation and an interface for the 40mm grenade launcher HK269 and the GLM/GLMA1. A front sight interface and bayonet holder can be mounted on the barrels as an option.

The Slim Line handguard developed by Heckler & Koch is positive-locking and connected to the upper receiver free of backlash. It can be removed without a tool and offers carrying sling fixing points, modular HKey interfaces on 3 and 9 o'clock as well as a continuous MIL-STD-1913 Picatinny rail on 6 o'clock.

The replaceable lower receiver defines the desired operating concept, thus reducing the training expenses for the shooter. Depending on the shooting training, the shooter can choose between a G36 and an HK416/AR-15 operating concept. All operating elements are attached on both sides, arranged symmetrically and can be customized. "Drop-in" solutions of the lower receiver extend the range of functions of the weapon with respect to match triggers or trigger assembly combinations.

The magazine well according to NATO STANAG 4179 (draft) ensures interoperability of the G36 weapon systems with the HK conversion magazine well, the HK416, and the commercially available AR-15 platforms. The grip interface is designed similar to the HK416 weapons family. Due to pistol grips with exchangeable grip shells and back straps similar to the P30 and SFP/VP series the rifle provides maximum adaptability to different hand sizes.

The ergonomically foldable and length-adjustable buttstock with height-adjustable cheek rest is free of backlash and connected to the receiver. The length adjustment has five locking posi-tions, allowing it to be adjusted dynamically to the personal protective gear of the operator. Straight, convex or concave buttstock caps provide the necessary comfort of the weapon in the firing position. Moreover, the buttstock can be folded to the right in each locking position. This achieves extremely compact transport dimensions.

Even though, the trigger always remains freely accessible. The case ejection port is not cov-ered, ensuring the ability of function also in an emergency in the transport condition.

Apart from maximum reliability, H&K weapons also excel with their standard-setting safety standard. Thus, it goes without saying that the HK433 is equipped with barrel obstruction ca-pability, drop safety (NATO AC225/D14), allows cocking in all safety positions and has a high "cook-off" as well as a robust and insensitive design when becoming dirty, at extremely cold and hot temperatures or in the event of lack of oxygen.

Camouflage colors and infrared-absorbing coatings are available upon request.

Special material combinations and surface finishes round off the overall concept of the HK433. They provide a low-maintenance system under extreme conditions in combination with a high service life above average.

The weight of the pure weapon of the HK433 at a barrel length of 16.5" is approx. 3.5 kg.

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