I agree with the others, the tube is some part of a model T or A.
As to the little pistol, you found, I'll bet that is an early squirt gun. Does is have a small hole in the end of the barrel? I believe a small rubber bulb fit at the butt end of the pistol where the two rings are. One would squeeze the bulb, immerse it in water, then release the bulb so it would draw water up inside. Then you just squeezed the bulb and the water would squirt out the barrel end. When you clean that up, I'll bet you find a hole in the butt end that connects with the hole in the barrel!
Knipper