I use the same on my backup gun... Been there for 8 years no issues. Even used my turkey gun for dove hunting and shot 100's of rounds with it through thick brush and all. Like Clark said, I rubbed both surfaces with rubbing alcohol real good. Let it sit for 10 minutes to be safe, then used automotive double sided tape... It's the grey tape with red plastic backing, and stuck it on. It's is designed for all weather use and did the job nicely 8 years ago.