A quick presentation by Weapon762 of the RGW Airsoft DA Sandman-S Style Silencer Set available at their online store... "The RGW Airsoft DA Sandman-S Style Silencer Set feature industry-best QD system for fool-proof quick one-handed mounting. No seizing and minimal point of impact shifts with this design. The mount features matte black finished stainless steel construction for the ultimate durability.
A suppressor with tracer unit for the Tokyo Marui M9 Gas Blowback Pistol demonstrated by Airsoft Shien... "Manufactured by RGW airsoft, Designed by Airsoft Shien, This KAC Style XM-9 Suppressor is designed for Tokyo Marui M9 GBB Pistols.
Comes with Supressor, Steel M9 Outer barrel with QD Slot Cut, and internal Spitfire tracer unit built by 5KU."
RGW Airsoft has different sets of their QD Front Set designed for M4 Gas Blowback Rifles. These mainly fit the WE Airsoft and VFC M4 GBB Rifles and available in different lengts: 4", 7", and 9". In this video they show you how to install these on your compatible M4 GBB Rifle.