Toronto Airsoft does an in-depth review of the KWA KM4 & KR AEG Series. The KR series is basically KWA's KR KeyMod Weapons Platform for those who prefer using the KeyMod Rail System open-sourced by VLTOR Weapon Systems. Two versions are availble: the KR9 and the KR12.

The KWA KM4 KR AEG Series are now available at eHobby Asia. All equipped with the KeyMod hanguard system you can find the KR5, KR12 and KR9 variants in stock. Only the KR14 is not available... "The KeyMod universal interface system is a new innovation in the firearm industry used for weapon ergonomics and mounting tactical accessories. The KeyMod design was developed by VLTOR Weapons Systems and was open to the public domain by Noveske Rifleworks for all manufacturers to use.