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Expert at? I'd say weapons qualification, maintenance, and general shooting fundamentals. I'm also relatively well-behaved when it comes to vaping, and general philosophy. As for my credentials, I was a combat arms soldier in the Army, I am an assistant manager, and I'm also a small-time writer of fiction and non-fiction.

You might consider the growing prepper movement as a target market?

Seems like steemgoblin beat me to replying here. I think that's a good idea. Another really popular niche in some markets is self-made guns, from common hardware and parts.