General Knowledge: Construction

     Now for the messy part, putting the pieces together so they resemble a weapon of some sort.  Pick an appropriate location where you can make a mess, and have proper ventilation for curing the adhesive.

1) 2" x 18" Barrel
2) 2" to 4" Increaser
3) 4" x 18" Chamber
4) Cleanout and Plug

     Sand all connecting surfaces with a fine sandpaper to ensure better adhesion. The apply primer to same surfaces you sanded, following that directly with the cement.  Tip, work on two pieces at a time.  Once all the pieces are together, let the whole assembly sit for at least 24 hours to allow the adhesive to set up and all the vapors to completely leave the pipe.  

     After it has cured for 24 hours, you can now finish the construction process.  First, put two holes in the 4" piece, so you can insert the nails.  Make sure that once you put the nails in that there is a 1/8" gap at the closest point.  Then attach a 6" piece of wire to each screw.  Next, assemble the igniter by attaching a wire to the bottom post and another one to the copper wire or metal tab on the side of the igniter body.  This is done so that the igniter can be detached and removed as a safety precaution, preventing just anyone from picking up your spud gun and using it.  The wires can be attached from the igniter to the gun by twisting and taping, wire nuts, or if you so desire Quick Connect pieces.  Note: make sure you tape up the igniter body so that your hand can't contact any of the open wires, as it will shock you, scare you, and prevent your gun from firing.

     Once the firing mechanism is assembled, you can add the final vital piece, the muzzle knife.  Simply file the edge of the barrel to a 45º angle, so when you push a potato against it, it cuts the spud to fit the gun just right, and with as little effort as possible.  Note: don't use a grinder on ABS, it melts with the friction!  With all this done, your finally ready to fire the damn thing.