In case you have already forgotten about it, Systema Engineering released a series of MP5-style PTWs or what they call the TW5 series including their own Challenge Kits. Hyperdouraku checks one TW5 that has been fully customised by Tokyo Move, calling it the TW5K as it based on the MP5K look. It has its original MOVE high precision barel, take down possible by pulling out three pins. Battery replacement, as well as maintenance can be done in the field.

Read the full review here and below is the overview video: