This is the P46S metal (silencer) barrel extension from SRC.
Introducing the SRC Airsoft P46S 3.5In Metal Barrel Extension CCW. This awesome Barrel Extension is the perfect addition to your 14mm CCW threaded AEGs, giving you a stealth tactical look while also adding 3.5 Inches to your firearms barrel. This barrel extension will fit flush with the front sight of your AEG so you have a perfect fit
Fits All 14mm CCW Thread AEGs