Now in stock at eHobby Asia are G&P Gas Blowback Carbine Kits if you want to build your own. You can a selection of the CQB or the standard Carbine kits with different types of markings on their metal bodies. Price range from US$165.00 to US$180, which make these kits a great deal for gas blowback airsoft rifle users. Prices do not include shipping costs though.

G&P WOK M4A1 CQB GBB Carbine Kit (Navy Seal)

G&P WOK M4A1 CQB GBB Carbine Kit (Marine)

G&P WOK M4A1 GBB Carbine Kit (Navy Seal)

G&P WOK M4A1 GBB Carbine Kit (Marine)

G&P WOK M4A1 GBB Carbine Kit (Skull Frog)