From the Super Mario Wiki
The Grape Shooter, also known as the Grape Pipe, is the name of Lanky Kong's personal weapon in Donkey Kong 64. It is a long narrow blowgun that appears to be made up of bamboo, and it fires grapes at enemies. Lanky fires from his Grape Shooter by blowing out of it.
Lanky can purchase the Grape Shooter at Funky's Store for three coins, starting at Angry Aztec onward. Like the other Kongs' personal weapon, the Grape Shooter allows Lanky to shoot at Banana Balloons, hit Grape Switches and snipe enemies from afar.
Later on his adventure, Lanky or another Kong can go back to Funky's Store to purchase more upgrades that apply to every Kong's weapon. Some of these upgrades include a larger ammo capacity, a sniper scope and enemy-seeking ammo.
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