Now in this step you can already see what your sketch should look like when you are done. By now it resembles the M16. So here what you will do is draw the rest of the top of the weapon by filling in the bottom part of the barrel and detailing the specs, then move across and sketch in all the details further along the barrel until you come to the mid section of the M16. When you get in the middle detail and define the shell of the gun as shown above. Since it is kinda difficult to tell you what every individual parts on this unit the best thing to do is enlarge the image and follow the visual instructions. After you have that down, you can start sketching out the grenade barrel by finishing of the rigged lining, it looks exactly like a washing machine plastic drain hose. Finish off this step by drawing in the cartridge case, the grip handle and the butt of the riffle.