| Term | Translation | Definition |
| Kammerfangstück | slide stop, slide stop lever, slide stop catch | ... |
| Kammergriff, Kammerstengel, Verschlussgriff | bolt handle | ... |
| Kartonscheibchen | cotton disc | ... |
| Kastenmagazin | box magazine | ... |
| Kleinkaliberlauf | small bore barrel (cal. 22) | ... |
| Klinge | blade | ... |
| Klingenrücken | blade back | ... |
| Klingenspitze | tip, blade point | ... |
| Kolben | piston | ... |
| Kolben, Schaft | buttstock | ... |
| Kolbenboden | butt cap | ... |
| Kolbenhels | grip of butt, hand of butt, small of butt | ... |
| Kolbenkappe, Schaftkappe | buttplate | ... |
| Kolbennase, Schaftnase | comb of stock | ... |
| Kombinationswaffen | rifle-shotguns, combination guns | ... |
| konische Hülse | conical base | ... |
| Korn | front-sight, foresight | ... |
| Kornsattel | ramp | ... |
| Kornschutz | front-sight cover | ... |
| Kugellauf | rifle barrel | ... |
| Kugelpatrone | ball cartridge | ... |
| Kugelpatrone für Flinte | ball cartridge for shotgun | ... |
| Kugelschusswaffen | rifled firearms, rifled guns | ... |
