You'll need licensing and start up $. And patience. Approvals. Trips to Russia. Compete with current importers. It's a hassle. But it does pay off if you do high volume. I've learned quite a bit about it over the years and have connections, but can't justify it.
It's a slow process.
Accessories are far less restricted and much more profitable. Of course if you're offering accessories, customers will also want guns. Kind of like a gas station operation where their majority of profits come from selling bullshit knick knacks.