HK 437
Over-the-beach (OTB) capable weapon system
NATO AC225/D14 compliant (drop safety, barrel obstruction resistance, extreme temperature reliability)
Adjustable gas system for supersonic and subsonic ammunition; mixed-ammunition capability
8-inch rifling optimized for supersonic and subsonic ammunition
Modular multi-calibre platform with high component commonality and cross-calibre consistency
Selectable operating concept (paddle or push-button controls)
Non-reciprocating, reversible charging handle with forward assist
Fully ambidextrous, ergonomic design with adaptable modular buttstock interface
NATO STANAG 4694 optics interface; day/night capability (image intensifier/thermal); low sight line
M-LOK or HKey QD handguard option
Chamber Check Marker for enhanced operational safety
Compact dimensions comparable to MP5 class, with extended range and improved terminal effect
Optimized for low-noise, medium-range police and special forces deployment
Cold hammer-forged HK precision barrel
Specifications
Caliber
300 BLK (7.62 mm x 35)
Magazine Capacity
30 Rd
Rate of Fire
850 Rd/min
Length Max
780 mm
Width Max
106 mm
Magazine Weight
158 g
Weapon Weight
3.1 kg
Barrel Length
9"
Height Max
242 mm
Muzzle Energy
1418 J
Muzzle Velocity
545 m/s
Trigger Pull
25 - 35 N
Chassis
The HK437 uses a modular aluminum upper and polymer lower receiver for strength and adaptability.
Operation
It operates using a short-stroke gas piston system with a rotating bolt, designed to ensure reliable cycling and consistent performance in various operational environments.
Bolt Carrier Group
A compact, high-performance bolt carrier group engineered for the HK437’s piston-driven system, delivering reliable cycling, reduced recoil impulse, and consistent operation with suppressed and short-barrel configurations.
Maintenance
Regular maintenance involves clearing the firearm and cleaning and lubricating key moving parts to ensure reliable operation.