Señora Sies

The Señora Sies was a modified M6-series Handgun, used by Ignatio Delgado. According to Delgado, the stock had been replaced with Oak wood, very scarce on Madrigal, and had been carved into "a piece of art" by his uncle. Delgado had to give the weapon to ODST Commander Faison, in return for his more powerful battle rifle, as Faison lay dying on the Mighty Sparrow. After Faison's death, the pistol is assumed to be lost or destroyed.

Trivia
It is unknown why Faison chose to use the Señora Sies instead of the plasma pistol of the jackal he killed, as he had commented on the value of Delgado's handgun. He may just have had a preference to projectile weaponry, or more likely refused to let Delgado waste precious time walking over to the plasma weapon to give it to Faison.