A guess maybe Unifor. They did aluminum forging in Laurens SC. Been bought out now with a different name. Umbrella Corp mentions using their forgings for their uppers in an old ad text.
Originally Posted By j3_: A guess maybe Unifor. They did aluminum forging in Laurens SC. Been bought out now with a different name. Umbrella Corp mentions using their forgings for their uppers in an old ad text.
Regarding the Sigma forge marking....PSA has stated that they now own this (Posted here ~2years ago). I haven't seen it on many receivers since PSA put their own forge press into service.