Interesting product that you can use for the KWA KRISS Vector GBB SMG which is available right now at eHobby Asia. The Sonic Laser Designator can be attached at the front-end of the KRISS and this at the 12 o’clock position directly above the muzzle and is operated with a remote pressure switch. Other than that, it’s made to work with just this airsoft gun rather than on multiple types.

Full Metal Construction
High precision laser
Come with Remote Pressure Switch
Tactical Attachment onto KRISS VECTOR Rifle
Operated by Two LR44
Wavelength: 630-680nm
Wattage: 5mw