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I am afraid that if you have any involuntary commitment on your record, you would be denied purchase of a firearm under the federal law. You going to purchase a gun is not a felony, but your failure to disclose the involuntary commitment would be a felony.
If your attorney did not properly represent you and did not properly advise you about the loss of firearms rights under federal law, you could indeed sue him for malpractice for this. Additionally there is a method to get the prohibition lifted and it requires going to court
with psychiatric testimony from your doctors and your mental health records to prove that the conditions leading to the involuntary commitment no longer exist and you are not a danger to yourself or others and the court issues an order of rehabilitation which is then sent to the FBI firearms unit so that when you purchase a firearm and your records are checked the purchase would not be denied.
These are your recourses for resolving this matter legally.
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