LCT Airsoft got new stuff to help you spruce up your LCK AEG. This is just the first part of a series of releases called the PK357 Forward Optical Rail System. Check your LCK AEG if it is compatible as this fits the LCKS-74UN, LCKMSU, and the VZKMSU. If your AEG is not in the list, better wait for the next announcements.
