HK Nomenclature
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The two number naming convention that HK has been using since at least the 1960s.
| FIRST NUMBER | TYPE OF WEAPON | SECOND NUMBER | CALIBER |
|---|---|---|---|
| 1 | BOX FED MACHINE GUN | 1 | 7.62x51mm NATO |
| 2 | BELT FED MACHINE GUN | 2 | 7.62x39mm |
| 3 | SELECT FIRE RIFLE/CARBINE | 3 | 5.56x45 NATO |
| 4 | SELF-LOADING RIFLE (CIVILIAN, ETC) | 4 | 9x19mm |
| 5 | MACHINE PISTOL (SMG) | 5 | .50 BMG |
| 6 | GRENADE LAUNCHER(COMP. WEAPON) | 6 | 4.6x36mm |
| 7 | LMG WITH LINKLESS FEED SYSTEM | 7 | .243 |
| 8 | SPECIAL MAGAZINE-FED LMG (BGS) | 8 | (NOT USED) |
| 9 | SEMI-AUTOMATIC PARAMILITARY RIFLE (USA) | 9 | 40MM |
| First Number | Generation | Second Number | Weapon Class | Third Number | Caliber |
|---|---|---|---|---|---|
| Gen 1 | 1 | Machine Gun, Magazine Fed | 1 | 7.62.51 | |
| 1 | Gen 2 | 2 | Machine Gun, Belt Fed | 2 | 7.62x39 |
| 2 | Gen 3 | 3 | Assault Rifle | 3 | 5.56x45 |
| 3 | Gen 4 | 4 | Semi Automatic Rifle | 4 | 9x19/40S&W/.45ACP |
| 4 | Gen 5 | 5 | Machine Pistols | 5 | .50 BMG |
| 5 | Gen 6 | 6 | Shoulder Fired Grenade Launcher | 6 | 4.6x30 |
| 6 | Gen 7 | 7 | Barrel Mounted Grenade Launcher | 7 | .300 BLK |
| 7 | Gen 8 | 8 | Hunting and Repeating Weapons | 8 | 37mm |
| 8 | Gen 9 | N/A | N/A | 9 | 40mm Grenade |
