I thought the same, that the Getz brothers bought their equipment from Paris, and moved it from Gettysburg to Beavertown.
See also the below quote taken from Colerain's home page:
"Colerain Barrel Co. was founded in 1990 by Scott Keller and Scott Kelley. The business was bought from R. Paris and Son, from Gettysburg, PA, who were the very first to manufacture swamped barrels on a production scale. Both of us were well suited for the business, I being an Electrical/Mechanical Designer and my business partner, Scott Kelley, a Machinist. We studied under Robert Paris Sr. and Robert Paris Jr. for some time in order to gather the particular skills required for Precision gun barrel manufacturing."