This service is for G&G Raider series, of any type. I take off triangle sight and add a PVC "silencer" similar to the fighting cat. It does not silent, but makes more like an amplifier. RIS is still rock solid and does not wobble at ALL. Inner barrel loses no support.
Also, I add a free pair of Magpul style sights. This "silencer" and sight service is 35$.
Here are some pics. Can have silencer and sights in BLACK or TAN.