For those that are interested, here are links to the best discussions of Melting Point Laws that I found;
http://www.guncite.com/journals/economic.htmlhttp://scholarlycommons.law.northwestern.edu/cgi/viewcontent.cgi?article=6828&context=jclcFrom what I found only Hawaii, Illinois, Maryland, Massachusetts, Minnesota, and New York have melting point laws.
Below is the Minnesota Statue
Minn. Stat. §§ 624.712; 624.716
Saturday Night Specials (Gross Misdemeanor)
It is a gross misdemeanor for a federally licensed firearms dealer to sell or for any person to manufacture or assemble, in whole or in part, a “Saturday night special” pistol. A “Saturday night special” pistol means any pistol (other than an antique firearm, air gun, or toy gun) that is made of any of the following materials:
< any material having a melting point of less than 1,000 degrees Fahrenheit;
< any material having an ultimate tensile strength of less than 55,000 pounds per square inch; or
< any powdered metal having a density of less than 7.5 grams per cubic centimeter.
John K