Well, the important bit is, the shelves have to appear to be full.

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One way to do this, of course, is to gather all the ammo from other stores, emptying their shelves.
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You can also mix in a lot of shotgun shells in with the ammo to make it look like you have more than you actually have.
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Alternately you can take a lot of common calibers and mix them in- there are 30-06 and45-70 on every shelf.
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Don’t forget to unwrap a bunch of 7.62×39 tulammo fill shelf space.
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Classically, you can also display loads of oddball calibers.
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OK, 218 Bee is not that oddball, I guess.
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7-30 Waters, now, it’s been years since i even heard of it, and I don’t think you can buy a repeating rifle in that caliber anywhere.

Still, the new improved Gander Mountain is a nice store, concentrating on new and used firearms and middling quality shooting/hunting clothing, as well as reloading supplies (With an emphasis on shotshell reloading). They kept the mannequins that used to display life vests and canoe paddles and put 5.11 clothes on them.
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Tactical girl seems to be getting ready to whip out some kung fu on someone.
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A change in perspective tells a different story. “Not that size, you moron, THIS size!”

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Metrosexual boys, all duded out in their new 5.11 gear, have arrived and are surrenduring right off.