A good list of the G&D Max 3 DTWs are available at RSOV.com and if you buy any of these, you get a free Vanaras DTW Magazine... "By G&D manufacturer of airsoft gun replicas the Systema PTW (Professional Training Weapon) system, PTW airsoft guns are now used by the military in combat training by its realism and durability. These guns come in 3 burst and full auto. Systema uses the realistic dimensions and weight and also the magazine. Although their airsoft guns are usually used for realistic firearms training, they are also popular for recreational use amongst airsoft players and collectors of replica firearms.

The 2014 Editions come with Advanced Micro Mosfet and built-in ECU board compatible with Systema PTWs. They can be probrammed to fire at full auto or 2 to 30 burst."