eHobbyAsia have details on the new TM M4:
Tokyo Marui M4 SOPMOD Electric Blow Back Rifle
Tokyo Marui released the new M4 SOPMOD Electric Blow Back Rifle with full metal constructed and equipped with New Version 2 SHOOT & RECOIL Engine
New blow back system and lock-bolt function stops the gun from firing on the last round of BB. The full metal constructed M4 with ABS stocks and grips brings you the feeling of a real M4 Metal RAS Handguard: New Version 2 SHOOT & RECOIL Engine
