A nail gun fastens things fast, read as rushing to secure or settle something. Tradition links it to efficiency, and to the risk of fixing too quickly.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.