Fig. 231.
Fig. 232.
Fig. 233.
The barrel of the gun is sometimes built of three pieces (Fig. 230, showing section) of thinner stock, which obviates the grooving but makes more work otherwise. The groove can be left open on top (Fig. 230) or covered with a thin strip (Figs. 231 and 232). In the latter case a depression must be made in the barrel, so that when the strip is put on there will be a long slot in which the string can play back and forth (Fig. 232). With this arrangement you can make a notch (Fig. 233) to hold the cord when drawn. The trigger can be of wood or wire, pivoted on a screw or nail, so that when pulled the string will be pushed up and released (Fig. 233).
A tube is sometimes fastened to the barrel, as in a real gun, and a plunger is sometimes fitted to the tube to start the arrows, or bullets in case they are used (Fig. 234).
Fig. 234.