An interesting video made by Richard Stefanits as he compares the Systema PTW, G&D DTW, and the Classic Army M4 AEG. You'll notice that there are differences in sizes among these AEGs, especially the PTW vs the Marui M4 Clone in the form of the Classic Army M4. As for the PTW and DTW comparison, find out if G&D made a good clone of the Systema product.