Barrel for e.g. rifle, has smooth post-acceleration chamber in which missile enters from stripped ballistic zone after pre-acceleration and complete spinning to receive additional acceleration which provides higher initial speed

摘要

The barrel has a stripped ballistic zone for pre-acceleration and complete spinning of missile at low speed. The missile after pre-acceleration and complete spinning in the stripped zone enters a smooth post-acceleration chamber. The missile receives additional acceleration in the chamber, where the acceleration provides an initial speed in order of 900 to 1000 meters/second.