Need Help Identifying this cannon toy

I don't know what this really is, it looks like some form of cannon or gun that belongs as part of another toy. The trigger on the top pulls back and releases by a spring. It's made of tin and 6" long and 2" wide. It was found in the back of an old 1920's Toledo Toy truck that was stored in a basement for 67 years. That's all the info I have any help identifying this would be great. Thank you all.