The Numbering System

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The Numbering System

HK has for many years used a numbering system to name their firearms. Lately, this numbering system appears to have been abandoned. However, it does provide insight into what HK used for many years and sheds light on the method for that system. The system is not consistent and is not used for all HK models.

FIRST NUMBER	TYPE OF WEAPON	SECOND NUMBER	CALIBER
1	BOX FED MACHINE GUN	1	7.62 X 51
2	BELT FED MACHINE GUN	2	7.62 X 39
3	SELECT FIRE ASSAULT RIFLE	3	5.56 X 45
4	PARAMILITARY RIFLE (GERMAN)	4	9 X 19
5	SUBMACHINE GUN	5	(NOT USED)
6	GRENADE LAUNCHER(COMP. WEAPON)	6	4.6 X 36
7	GRENADE LAUNCHER (ADD-ON WEAPON)	7	(NOT USED)
8	(NOT USED)	8	(NOT USED)
9	SEMI-AUTOMATIC PARAMILITARY RIFLE (USA)	9	40MM

For example, the HK91 is found by adding the 9 from the first column with the 1 from the second column to determine model designation. The HK53, 21, 23, 69, 79 among others are numbered this way. The P11 pistol is not. The G11 is not. As you can see, inconsistent, but quite simple!