Easy to prove it came from said computer . Proving the fingers that typed it , Not so easy . OP said it was a friend , If they could legally purchase a firearm , not a felon and so on , I would not have a problem making it happen . I personally didn't sell one time at a gun show because I just didn't get a feeling the guy was on the up and up. We have to use some judgement on our part . Legal today might not be legal tomorrow . They are making and changing the laws so much now that we can't keep up with the laws .
I have a Mossberg Shockwave and before it is over , someone somewhere will get arrested for a NFA firearm without a stamp . Not knocking the men in Blue but most are not gun people . Someone will pull the tape out or the 18" wooden dowel and the cuffs will be on . The officers have a lot on them and I would not want to do their job. I worked for a police department for over 15 years as a mechanic on the vehicles . There was about 600 officers and only a hand full were really into guns . Again this is not meant as a slam on the officers .
They will get out of it because they are legal for now ( unless someone gets their ink pen out and bans them like the bump stocks ). Also remember the Brace ,legal to shoulder , not legal , legal again . The majority of gun community are law abiding people as the criminals will always be criminals . Before it is over with ,all the 80% firearms might be illegal , along with the braces , the short firearms that shoot shotgun shells and so on . They are slinging so much poop on the wall in Washington that eventually something is going to stick .