Black Rhino Blowguns have been making blowguns and blowgun parts since 1983. If you have purchased a blowgun from any big box store in the last 40 years you have used our products. This is a combination of the many styles of Darts that are available for the 40 Caliber blowgun. Yes our darts will fit your 40 Caliber Blowgun. Most competitors follow the true size of 40 caliber Blowguns but if by chance the ammo doesnt fit let us know and we will do a full refund. Target Wire Darts--- the main stay of 40 caliber a light fast shooting round that is great for target practice