Variants of a mold are catalogued separately, so each one has its own sets and minifigs. Check these too if something you expect is missing here.

• 32074c01 Launcher, Technic Competition Cannon, Round Bottom with Same Color Ends Mold of this part
• 32074c02 Launcher, Technic Competition Cannon, Round Bottom with Black Ends this part is a mold of it
• 32074c03 Launcher, Technic Competition Cannon, Round Bottom with Lime Ends this part is a mold of it
• 57028c01 Projectile, Technic Competition Arrow, Liftarm Shaft with Hollow Black Rubber End Pair of this part
• 57028c02 Projectile, Technic Competition Arrow, Liftarm Shaft with Hollow Light Bluish Gray Rubber End Pair of this part
• 57028c04 Projectile, Technic Competition Arrow, Liftarm Shaft with Hollow Yellow Rubber End Pair of this part