Its a retailer policy. Not law.
HeadOnTactical.com
They make policies like that to protect themselves from lawsuits.
Sweet. Thanks for the quick replies; I appreciate it.
No problem.You can also find sites that will do it if your 18.
Usually all they ask you to do is confirm that you are over the age limit. I've bought a few guns off different sites and never had to "Sign" for any of them.