|Country of Origin||Germany|
|Weapon Type||Semi-Automatic Pistol|
|Magazine Capacity||10-12 Round Magazine|
|Manufacturer||Heckler & Koch|
The Heckler & Koch Mk. 23 Mod 0 is a semi-automatic pistol designed and developed by German manufacturer Heckler & Koch. It is the standard issued sidearm of USSOCOM Navy Seals.
The Heckler & Koch Mk. 23 Mod 0 was seen in Mario Warfare. It was in the hands of a Shy Guy who threatened Toad after he ran out of ammo in his MAC-10s. Toad took the gun and shot the Shy Guy with it and then used it in his fight against Bullet Bill. Realizing he was out of ammo, Bill shot Toad with his IMI Desert Eagle. The version Toad had was a version with a rail attachment mounted on the barrel and an extended magazine.