Long life, because supports up to 50,000 rounds per m2 with 9mm Parabellum. The backstop snail is the best solution to stop the bullets handgun and long gun to 7,62 caliber, you can shoot from any angle, it does not produce toxic waste to slow the projectile by friction and is maintenance free.
It is made with steel plates especially hard positioned at an angle. The impact of the projectile on the inner walls of the backstop is limited by the minimum inclination of the steel sheets with respect to the axis shooting. Once transported to the back of the structure, the projectile passes through an opening which prevents its return, and impact tangentially on the steel cylinder which forms the spiral, acquiring circular makes it lose all its kinetic energy movement, to fall into the collector.