New!!! 37MM Cyclone Projectile is a rifled 37mm projectile that utilizes the barrel to spin stabilize the 37mm projectile on launch creating a more consistent arc for increased accuracy. This 37mm ammo utilizes an included O-ring to help produce consistent launch pressures. These projectiles are designed to work with our 3.5" casings. They currently come in Fused or Unfused. A high pressure variant of this projectile is coming soon.