For SIG 550, 552 and similar models
The GB-05 motor series (A1 to A5) uses heat resistant enameled wire (up to 200°C)
to build the core of the motor. This helps to maintain the temperature at an efficient level, even under the full power, also it greatly increases the durability of the motor and decreases the battery consumptions.
A set of ball bearings are installed at both...(Continue reading)