ICS Sportline AEG"s with Turbo2000 motor and M100 spring or below are suitable for installing MC-230 20A Mini Blade Fuse (yellow);
ICS AEG"s with MOSFET or SSS device are suitable for installing MC-240 25A Mini Blade Fuse (white);
ICS AEG"s with Turbo3000 motor and M120 spring or above but without MOSFET or SSS device are suitable for installing MC-211 30A Mini Blade Fuse (green).

Some of our models have "spring release" function. The spring is released once your engaged the safety. By reason of the rotating position of the gears are not the same as the position before you engaged the safety, therefore there will has the chance to fire 2 bbs in 1 shot, or with low velocity, which are normal conditions.
We recommend that after using your AEG, Unload the magazine, select your fire selector to semi-auto, and clear your gun by firing 2 to 3 times in order to clear the remaining BBs in your HOP-UP, and re-positioned the piston back to its normal position, then engage the safety to release the spring tension, which could reduce the possibility of such problem occurred.

The Hammer disconnector in the hammer set might be malfunctioned or damaged. Checked and repaired by professional mechanics at the gunshop is recommended.