RUGER--I believe like most weapon manufactures have magazines subbed out to companies that specialize in such things.
years ago the sub company would print the manufactures logo on the mags destined for the manufactures place of business.
now day many are just simply sending the same thing as what you buy aftermarket.
Mec-Gar now ahs a huge piece of the manufactures market and aftermarket on magazines.
course NOT all aftermarket magazines are created equal,