Hi Gary and welcome. Certain states have Melting Point Laws (Firearms that have certain alloy frames (considered pot metals) that can melt at lower temperatures than other metals). There are a few States that are listed here (not all) and does not apply to any States not on this list): budsgunshop.com/state_restrictions.php ---------- Cheers, stay safe and enjoy!

Hi Gary, these laws are designed to eliminate the sale of inexpensive handguns often called "Saturday night specials."
Handguns (other than antique firearms) where the frame, barrel, cylinder, slide or breech-lock is composed of any material with a melting point of less than 1,000 degrees F, or an ultimate tensile strength of less than 55,000 psi, or comprised of any powdered metal having a
density of less than 7.5 grams/cubic centimeter. I.E.: Ruger Wrangler .22 revolvers, Walther rimfire pistols, Cobra, Phoenix Arms, Heritage Arms, Hi-Point, and GSG rimfire pistols
There are only a few states that have these laws, Illinois and Minnesota are two.
Stay safe & have a great day!