Yes, it's our constitutional right to sue anyone (as long as the losing party pays the fees) - but manufactures and dealers will likely only be liable for negligence (as they were not the ones who used the gun for a wrong purpose, but they might be the reason that someone violent got their hands on the gun in the first place (unless it is someone else's fault: like if a kid stole it from his parent because the parent didn't lock it up well enough, etc...)).
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