-Black mechbox similar to some JG v2 style guns.
-Spring guide is only visible from one side of the mechbox.
-Systema style air nozzle
-Plastic/nylon bushings
-Plastic/ some form of polycarb looking spring guide.
Its very similar to the mechbox I pulled out of one of the JG 416.
Once again here are the pics from the 416 review, lets do some comparisons.
From this angle both mechboxs could be mistaken to be similar. However on the 416 mechbox it says SB, where on the bastard soft gun its simply a blank square.
Notice in this picture that the spring guide and spring are also visible from the other side of the mechbox as well. Contacts on the 416 mechbox selector plate are copperish colored while the ones in the pics above are silverish.
Fuse housings are also different.
I dont really have much more to add, Im just going by the pictures.