1. We draw a rectangle, otcherchivay the horizontal line (it will be located approximately on 1/3 heights of this rectangle) — the lower line of a trunk of the gun and schematically we draw the handle.
2. We start tracing the gun.
3. After we drew all main lines, we will shade all surface.
To add dark shades.
4. We shade (we smear either paper, or cotton wool, or other).
5. We erase a smearing at the edges of the gun, we do patches of light on it.
6. We trace the main lines, in some places we shade, we do transitions of shadows. The sketch (sketch) of the gun is ready.
Below video of drawing of this gun is shown.