No, they shouldn't be allowed to sue the manufacturers, especially if the dealer doesn't get directly supplied by the manufacturer (i.e. pawn shops, second-hand stores, yard sales, etc.). The manufacturer's liability is waived when the weapon has passed through multiple sets of hands, they have no control over who acquires the weapon. The only exception to this is if the manufacturer directly supplies weapons to the dealer (who is negligent); it would show negligence on part of the manufacturer to sell their weapons to a dealer that's not going to follow proper procedures. It's like suing Kitchen Aid for making knives because one person stabbed someone else with a Kitchen Aid knife set they bought used off eBay. It's absurd.
TL;DR, sure, sue the dealers, but the manufacturers are a different story
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