The G&G Armament SMC9 Gas Blowback Submachine Carbine which is the complete set that comes with the GTP9 GBB Pistol of G&G already installed is available at CRW Airsoft in Hong Kong. The GTP9 features G&G's Whirl Valve with external Hop-up adjustment and ambidextrous controls. The SMC9 kit allows one to turn the GTP9 into a carbine for a stable shooting platform and in this video show the features and a test to give you an idea how it works.