This mod can be purchased unranked from Baro Ki'Teer for 150,000 150,000 and 400400. Note however that Baro Ki'Teer's stock changes with each appearance, and may not have this item available every time.
Primed Target Cracker is essentially the Target Cracker mod with Legendary rarity and 5 more ranks. It is considered the same mod as its Uncommon counterpart, and thus both mods cannot be equipped together.
Can be combined with Sharpened Bullets for a total increase of +185% after getting a kill.