Quoted:
"Mil-Spec" as used in the civilian world is nothing more than a catch phrase, there is no legally binding definition of it when it comes
to something ANY OEM makes UNLESS, it is to meet Military Specifications as outlined in a contract to manufacture, for the United States Army,
Marine Corps, Air Farce et al, ad nausea.
Buyer beware for anything sold, traded, bartered or otherwise moving from one persons hand to yours, Mil-Spec doesn't mean shit that can be quantified.
Now that that is out of the way, Mil-Spec usually means that it conforms to generally what the people above me said. But if you're
looking for a legally binding definition, you're SOL.
i think mil-spec implies that whatever is being made, is made to the MIL specs. For example, I worked at a glass place for a while. They had MIL-(some random numbers and letters etc) glass. customers could specify that the MIL spec glass was used, even if they weren't making pieces for military hardware.
if people say something is mil-spec, such as in this case, a lower reciever, then there should be a set of specs somewhere out there that describes what they are making. If not, then i would say it is fraud, whether anyone will do anything about it, or if there is any legal recourse, i don't know. They can say they are made from mil-spec material, same thing applies.