Make sure you ask what kind of margins you can make on gun sales - when you find out how low it is you'll probably change your mind. Local stores have to compete with the volume giants like Bud's - and that ain't easy...
x2. I'm willing to bet that most guys aren't making more than 20% profit margin (25% markup) on firearms. So every time you sell a glock or an XD, you make $90...
On accessories, I'm not aware of any big firearms-accessory warehouse outfits, you might end up either buying from one of the discount online guys or direct from the manufacturers, then trying to make a profit off of a cost not much lower than MSRP.
One thing a lot of people don't consider-shipping costs. Say you find sources for products at 35% below MSRP, unless your source has their own transportation dept. you're going to lose up to 20 of that 35% on shipping costs
Thats something I'm still trying to teach the buyers at my store
Also, startup costs could be hefty. Think about your local shop. Small place? Maybe 25-35 guns at a time? That's around $20,000 in inventory.