If you want to put a tracer unit on the KWA KRISS Vector GBB, you can use this Hornbill Products KRISS Outer Shell for Star Airsoft Tracer Unit (Power Up Version) which is available right now at RSOV.com. This allows you to have an adapter that can fit the tracer unit to your KRISS Vector GBB. The Star Airsoft Tracer Unit will have to be purchased separately.

This Hornbill Products Specter DR Riser and Scope set is made specifically for Star, G&G, Army, Ares, WE, and ICS L85/SA80 airsoft replicas which generally is most of the airsoft replics in the market today. The scope is the usual magnified and fixed at 4X if you are ok with it. It is fully coated and adjustable with 11 levels of illumination in red.