Fixed Hop-Up

A device for giving the bullet backward rotation, which straighten ballistic curve and increases the range is called Hop-Up. Weapons with a fixed variant are factory set, with no possibility of control. The pressure is therefore permanently set and can not be changed by the user. When using a weapon with a fixed Hop-up it is necessary to respect the recommended weight of ammunition. With lower weight of BBs permits longer range weapon (hop-up allows the bullet due to the lower weight more rise), but on the contrary, lower accuracy. On the other side, heavier BBs are advantageous when the need for better accuracy, but the range will be shorter.