An interesting addon to the Krytac KRISS Vector is the Proto Arts Gear Strike Rail System 2.0 from Laylax which unfortunately will be sold exclusively in Japan. The “Vector Strike Rail System 2.0” is an evolution of the aggressive design of its predecessor, featuring an integrated knuckle guard with the “Advanced Grip” that spikes all front parts. Its large spikes, inspired by a crusher motif, and thicker side rails contribute to an unprecedented, overwhelmingly massive look.

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.