Now in stock at Airsoft GI is the A&K PTW M4A1 MAX... "The A&K MAX PTW is a step up to producing quality airsoft guns to match the real gun counterpart. Externally, the A&K PTW features standard equipment that you would find on most m4 variant airsoft guns such as the metal outer barrel, metal body, polymer hand guard, polymer pistol grip, and polymer crane stock. On the crane stock there is a felt padding to add comfort to the user.