| Term | Translation | Definition |
| decapper, decapping device, decapping punch | | ... |
| decocker, decocking lever | | ... |
| decocking, uncocking | | ... |
| defender | | ... |
| defense, defence | | ... |
| defensive shooting | | ... |
| die | | ... |
| disarm | | ... |
| disconnector | Unterbrecher | ... |
| dispersion pattern | | ... |
| dispersion, spread, pattern | | ... |
| distance between sights | Visierlänge | ... |
| dominant hand, off-hand, strong hand | | ... |
| double action (DA) | | The trigger cocks and releases the hammer or striker, the mechanism also enables single action function. The trigger has quite heavy and long pull.... |
| double action only (DAO) | | Works in the same way as the double action (DA). The trigger cocks and releases the hammer or striker, except there is no single action (SA)...... |
| double barreled rifle, side-by-side rifle | Doppelbüchse
| Two independent rifles, built on one frame. Available in either side-by-side or over-and-under barrel configuration ... |
| double barreled shotgun | Doppelflinte, Querflinte
| Is a shotgun with two barrels in side-by-side configuration ... |
| double feed | | ... |
| double shot | | ... |
| double tap | | ... |
| double trigger | | ... |
| double-conical case | doppelkonische Hülse | ... |
| draw | | ... |
| drift, derivation | Derivation
| Is diversion of the bullet from its line of departure caused by the rotating motion of the barrel’s twist... |
| drill cartridge, dummy cartridge | | ... |
| dry fire practise, dry firing | | ... |
| dump pouch, magazine drop pouch | | ... |
