The 98 cents’ worth of plastic shims that came with your new $1,800 semiauto might be the most important part of the whole shotgun. Stock shims let you fine-tune cast and drop to get a perfect fit—and ...

You open the box of your new shotgun, you look for the instruction manual that’s under a plastic envelope containing some black oval-shaped things, toss them aside and open the manual to the assembly ...

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