If you are of average intelligence you will pass without practice tests. The course material is straight forward and easy to understand. Just pay attention.
I have one one each vehicle, one on my reloading bench, and one on my safe. My camper will soon be sporting one as well.
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Where are you from? I think the best way to learn about the differences is a hands on approach. I'm sure there are a few members here who would be happy to get together and help you.
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Last time I was there I was looking for a Rem 700. Boy did I find one......but that wasn't enough, so I got a slick chassis, QR scope mount, and bipod for it too.Damn impulse shopping!