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How to buy a crossbow
Figure out what you will be using the crossbow for.
First thing first, realize what you're going to be using the crossbow for. Hunting or simply target shooting? If target shooting, a relatively cheap crossbow is a great option mainly because reliability and velocity won't factor in as much.
However, if you are planning to hunt yearly, then selecting a trusted name brand with great reviews, will be what you should do. Factor in overall velocity of the crossbow.